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a catch 22 situation

Essential Words Level 12

abdomen

ablation

Human Body & Health

aboriginal

abscission

absenteeism

Essential Words Level 2

absorption

Ecology & Environment

absurd

Essential Words Level 10

abundance

Essential Words Level 4

abundant

Essential Words Level 9

abutment

accelerate

Essential Words Level 7

accentuate

Essential Words Level 5

access

Essential Words Level 3

accessibility

Essential Words Level 3

accessible

Essential Words Level 3

acclaim

Essential Words Level 5

account for

Essential Words Level 3

accountability

Essential Words Level 3

accountable

Essential Words Level 3

accumulate

Essential Words Level 9

accumulation

Human Body & Health

accumulative

Essential Words Level 9

acid

Ecology & Environment

acid rain

acidic

Ecology & Environment

acidity

Ecology & Environment

acoustic

acoustics

acrobat

Essential Words Level 12

acrobatic stunt

Essential Words Level 12

adapt

adaptation

adopter

adoptive

Essential Words Level 14

advance

Essential Words Level 1

advancement

Essential Words Level 1

advantage

Essential Words Level 1

advantageous

Essential Words Level 1

advent

Essential Words Level 2

adverse

Essential Words Level 7

adversity

Essential Words Level 10

advertent

Essential Words Level 13

advocate

Essential Words Level 4

aesthetic

affluence

Essential Words Level 10

affluent

Essential Words Level 10

aggravate

Essential Words Level 6

aggravating

Essential Words Level 11

agile

Essential Words Level 3

agitate

Essential Words Level 3

agricultural

airborne

albeit

Essential Words Level 14

alchemy

Ecology & Environment

alertness

Essential Words Level 3

algae

algorithm

align

Essential Words Level 1

alkali

Ecology & Environment

alkaline

Ecology & Environment

alkalinity

Ecology & Environment

alliance

alligator

alluvium

Human Body & Health

alpine

Human Body & Health

alter

Essential Words Level 8

alternate

Essential Words Level 10

alternating

Essential Words Level 8

alternation

Essential Words Level 10

alternative

Essential Words Level 10

altitudinal

aluminium

Ecology & Environment

ambiguous

Essential Words Level 13

ambivalent

Essential Words Level 13

amnesia

amphibian

ample

Essential Words Level 4

amplitude

analogous

analytical

Essential Words Level 8

anarchy

anatomical

anatomically

anatomy

ancestor

ancestral

anchor

Essential Words Level 12

ancient

anemone

anonymous

Essential Words Level 13

antarctic

antennae

anthropoid

anticipate

Essential Words Level 1

anticipated

Essential Words Level 1

antiquated

Essential Words Level 4

apparatus

appealing

Essential Words Level 4

approximately

Essential Words Level 3

apt

Essential Words Level 7

aptly

Essential Words Level 7

aquaculture

aquatic

aquifer

Human Body & Health

arable

arbitrary

Essential Words Level 13

archaeological

archaeologist

archaeology

archetypal

architectural

arctic

arid

arise

Essential Words Level 1

arthropod

artistic

ascend

Essential Words Level 5

ascertain

Essential Words Level 8

assert

Essential Words Level 10

assimilate

Essential Words Level 11

assimilation

Essential Words Level 11

assortment

Essential Words Level 5

asteroid

astounding

Essential Words Level 11

astronaut

astronomer

astronomical

astronomically

astronomy

asymmetrical

Essential Words Level 5

atmospheric

atom

Ecology & Environment

attain

Essential Words Level 4

aurora

aurora borealis

authoritarian

autonomous

avalanche

Human Body & Health

avert

Essential Words Level 14

baffle

Essential Words Level 11

barrier

Essential Words Level 10

beak

beehive

benign

bestow

Essential Words Level 14

biodiversity

biological

bioluminescence

bioluminescent

biome

blind

Essential Words Level 10

blur

Essential Words Level 7

breed

breeding

brittle

broaden

Essential Words Level 8

brood

brooding

brushstroke

buoyancy

burgeon

Essential Words Level 12

burial site

by-product

caldera

Human Body & Health

caliber

Essential Words Level 6

camouflage

canine

canopy

canyon

Human Body & Health

capitalism

capitalistic

captivating

Essential Words Level 11

carbon dioxide

Ecology & Environment

carbon footprint

carbonate

Ecology & Environment

cardiovascular

carnivore

catalyst

Ecology & Environment

caterpillar

caution

Essential Words Level 1

celebrated

Essential Words Level 5

celestial

cellulose

ceramics

cetacean

chaotic

Essential Words Level 10

characteristic

Essential Words Level 8

characterize

charged

Essential Words Level 10

charisma

Essential Words Level 11

chickenpox

chiefly

Essential Words Level 8

chlorophyll

chromosome

chronic

chronological

circadian

circulate

circumvent

Essential Words Level 14

civilization

classification

Essential Words Level 8

coarse

Essential Words Level 10

coastal

cocoon

cognition

cognitive

cognitivity

coherent

Essential Words Level 10

cold-blooded

collapse

collide

Essential Words Level 3

collision

Essential Words Level 3

colloquial

Essential Words Level 14

colonial

colonist

colonization

colonize

colony

colossal

Essential Words Level 4

combust

combusted

combustible

combustion

comet

common

Essential Words Level 2

commonplace

Essential Words Level 2

comparatively

Essential Words Level 3

competitiveness

Essential Words Level 3

composer

composition

Human Body & Health

compound

Ecology & Environment

conceal

Essential Words Level 14

conceivable

Essential Words Level 7

conceivably

Essential Words Level 7

conceive

Essential Words Level 7

concertina

concerto

concur

Essential Words Level 10

condense

Ecology & Environment

conform

Essential Words Level 4

conformity

Essential Words Level 4

congregate

congregation

conjunction

Essential Words Level 13

conqueror

conscientious

Essential Words Level 11

conservationist

consist of

Essential Words Level 2

consistently

Essential Words Level 1

conspicuous

Essential Words Level 10

conspicuously

Essential Words Level 10

constellation

constitute

Essential Words Level 2

consumption

Essential Words Level 2

contaminant

contaminate

contentious

Essential Words Level 14

continent

continental

contradictory

Essential Words Level 1

contributing

Essential Words Level 1

contribution

Essential Words Level 1

contrivance

Essential Words Level 14

contrive

Essential Words Level 14

controversial

Essential Words Level 3

conventional

Essential Words Level 5

convergent

Human Body & Health

convey

Essential Words Level 4

copious

Essential Words Level 14

coral

coral reef

corresponding

Essential Words Level 2

corrosion

Ecology & Environment

corrosive

Ecology & Environment

cortex

counteract

Essential Words Level 14

counterfeit

counterpart

courtship

credential

Essential Words Level 7

creep

Essential Words Level 10

cretaceous

crevasse

Human Body & Health

crevice

Human Body & Health

cripple

Essential Words Level 6

critique

crocodile

crocodilian

crop

cross-pollination

crust

Human Body & Health

crustacean

crustal

Human Body & Health

crystalline

Human Body & Health

culprit

Essential Words Level 1

cultivable

cultivate

cultivation

currency

custom

Essential Words Level 5

customary

Essential Words Level 5

deadlock

Essential Words Level 14

debilitating

Essential Words Level 13

debris

decay

deceptively

Essential Words Level 7

deciduous

decipher

declination

decline

decompose

deforest

deforestation

defy

Essential Words Level 8

degenerative

degradation

Essential Words Level 9

degrade

Essential Words Level 9

dehydrate

delicate

Essential Words Level 7

delighted

Essential Words Level 6

demand

Essential Words Level 1

demise

denote

Essential Words Level 13

dense

Essential Words Level 10

depict

depiction

deplete

depletion

deposition

Human Body & Health

descendant

desertification

Human Body & Health

destabilize

Essential Words Level 13

deter

Essential Words Level 6

deteriorate

deterioration

detrimental

Essential Words Level 6

devout

Essential Words Level 13

dictate

different

Essential Words Level 9

differentiation

Essential Words Level 9

diffuse

Essential Words Level 11

diffusion

Essential Words Level 11

digestive

dilemma

Essential Words Level 10

diligent

Essential Words Level 7

dim

Essential Words Level 10

diminish

disadvantage

Essential Words Level 1

disadvantaged

Essential Words Level 1

disadvantageous

Essential Words Level 1

disapproval

Essential Words Level 4

discernible

Essential Words Level 9

discharge

discredit

Essential Words Level 7

discrimination

disguise

Essential Words Level 7

disparity

Essential Words Level 8

disperse

Essential Words Level 11

dispersion

Essential Words Level 11

disposition

Essential Words Level 13

disregard

Essential Words Level 4

disruptive

Essential Words Level 7

dissect

Essential Words Level 8

disseminate

Essential Words Level 11

dissemination

Essential Words Level 11

dissipate

dissipation

dissolve

Ecology & Environment

distinct

Essential Words Level 9

distinctive

Essential Words Level 9

distinctly

Essential Words Level 9

distinguish

Essential Words Level 9

distinguishable

Essential Words Level 6

distinguished

Essential Words Level 6

distort

Essential Words Level 8

distorted

divergent

Human Body & Health

diverse

Essential Words Level 9

diversity

Essential Words Level 8

divert

Essential Words Level 7

documented

Essential Words Level 3

dome

domesticate

domestication

dominance

Essential Words Level 9

dominant

dominate

Essential Words Level 9

domination

Essential Words Level 9

dormancy

dormant

dramatic

Essential Words Level 4

ductile

Ecology & Environment

dune

Human Body & Health

durable

Essential Words Level 3

dwell

dweller

dwelling

eclipse

ecological

ecological footprint

ecosystem

ectotherm

ectothermic

eject

Human Body & Health

elaborate

Essential Words Level 7

electric

electron

elicit

Essential Words Level 10

eliminate

Essential Words Level 5

elliptical

elude

Essential Words Level 14

embodiment

Essential Words Level 12

embody

Essential Words Level 12

embryo

embryonic

emerge

Essential Words Level 2

emergency

Essential Words Level 2

emerging

Essential Words Level 2

emigration

emission

emit

emphasis

Essential Words Level 5

emphasize

Essential Words Level 5

enactment

encircle

encompass

Essential Words Level 2

encroach

encroachment

endangered

endemic

endotherm

endothermic

endure

Essential Words Level 3

energetic

Essential Words Level 3

engrave

engross

Essential Words Level 14

enigmatic

Essential Words Level 13

enlighten

Essential Words Level 12

enlightened

Essential Words Level 12

enlightenment

Essential Words Level 12

enormous

Essential Words Level 4

enrich

enrichment

enrollment

Essential Words Level 1

ensemble

entrenched

Essential Words Level 14

environmental

environmentally friendly

envision

Essential Words Level 12

ephemeral

epitome

Essential Words Level 12

epitomize

equator

equivalent

Essential Words Level 6

equivocal

Essential Words Level 13

eradicate

Essential Words Level 5

erode

Human Body & Health

erosion

Human Body & Health

erratic

Essential Words Level 9

erupt

Human Body & Health

eruption

Human Body & Health

escalate

Essential Words Level 5

escarpment

Human Body & Health

estimate

Essential Words Level 1

estimation

Essential Words Level 1

estuary

evaporate

Ecology & Environment

evaporative

Ecology & Environment

evict

evident

Essential Words Level 3

evoke

evolve

Essential Words Level 3

exacerbate

Essential Words Level 6

exaggerate

Essential Words Level 4

excavate

excavation

exceedingly

Essential Words Level 4

excess

Essential Words Level 4

excessively

Essential Words Level 4

excrete

exemplify

Essential Words Level 12

exemplifying

Essential Words Level 12

exhale

exhaust

Essential Words Level 7

exhausting

Essential Words Level 7

exist

Essential Words Level 2

existence

Essential Words Level 2

existing

Essential Words Level 2

exoskeleton

exotic

expanded

Essential Words Level 2

expel

Essential Words Level 14

experience

Essential Words Level 1

exploit

exploitable

exploitation

exponentially

Essential Words Level 5

export

extinct

extinction

extinguish

Essential Words Level 5

extrinsic

eyesore

Essential Words Level 11

fabricate

facet

Essential Words Level 12

fahrenheit

fall short of

Essential Words Level 6

faults

Human Body & Health

fauna

fertile

fertility

fertilization

fertilize

fertilizer

feudal

figurative

filmmaker

Essential Words Level 8

fine-tune

finite

Essential Words Level 6

fishery

flamboyant

flammable

Ecology & Environment

flora

flourish

flourishing

Essential Words Level 10

fluctuate

Essential Words Level 9

foliage

footprint

forage

forager

foraging

forfeit

Essential Words Level 14

formation

formidable

Essential Words Level 11

fossil

fossilization

fossilized

fragrant

Essential Words Level 8

frigid

fungi

fungus

galaxy

gaseous

Ecology & Environment

gasification

Ecology & Environment

gasify

Ecology & Environment

gene

generalization

Essential Words Level 10

genetic

genetically

genre

geological

Human Body & Health

geomagnetic

Human Body & Health

geothermal

Human Body & Health

geyser

Human Body & Health

gigantic

Essential Words Level 4

give weight to

Essential Words Level 5

glaciation

Human Body & Health

glacier

Human Body & Health

globalization

globalize

gradually

Essential Words Level 5

gratifying

Essential Words Level 8

gravitational

gravity

grieve

Essential Words Level 8

growl

gyre

habitat

habitation

habituate

halt

Essential Words Level 13

hamper

Essential Words Level 6

handicraft

Essential Words Level 7

haphazardly

Essential Words Level 14

harmony

harness

harvest

hasten

Essential Words Level 7

hatch

hatchling

havoc

Essential Words Level 14

hazard

Essential Words Level 6

hazardous

Essential Words Level 6

heighten

Essential Words Level 12

hemisphere

herbaceous

herbivore

hereditary

heredity

heyday

Essential Words Level 14

hibernate

hibernation

hibernator

hierarchy

Essential Words Level 8

hieroglyphic

highlight

Essential Words Level 3

hinder

Essential Words Level 6

hindrance

Essential Words Level 6

household name

Essential Words Level 7

hue

humidity

hydraulic

hydroelectric

hydrogen

Ecology & Environment

hydrothermal

hypothesis

Essential Words Level 8

iconography

ideology

Essential Words Level 14

igneous

Human Body & Health

ignite

Essential Words Level 10

illuminate

Essential Words Level 10

illumination

Essential Words Level 10

imitation

Essential Words Level 11

immune

immunization

immunize

impart

Essential Words Level 6

impartial

Essential Words Level 12

impede

Essential Words Level 6

impediment

Essential Words Level 6

implicate

Essential Words Level 11

implication

Essential Words Level 12

impressive

Essential Words Level 2

improperly

Essential Words Level 3

impulsively

Essential Words Level 13

impurity

Ecology & Environment

in retrospect

Essential Words Level 11

inaccessible

Essential Words Level 3

inadvertent

Essential Words Level 13

inadvertently

Essential Words Level 13

inalienable

inanimate

Essential Words Level 14

inaudible

incessant

Essential Words Level 7

incidence

Essential Words Level 5

incomprehensible

Essential Words Level 13

incubate

incubation

indifferent

Essential Words Level 9

indigenous

indiscriminate

indispensable

Essential Words Level 2

inevitable

Essential Words Level 12

inexhaustible

Essential Words Level 10

inexplicable

Essential Words Level 12

infancy

Essential Words Level 12

infection

infertile

infestation

Essential Words Level 13

inflatable

inflation

influence

Essential Words Level 1

influential

Essential Words Level 1

infrared

infrequently

Essential Words Level 7

ingenious

Essential Words Level 11

ingenuity

Essential Words Level 11

ingredient

Essential Words Level 2

inhabit

inhabitable

inhabitant

inherently

inhibit

Essential Words Level 6

inhospitable

innumerable

Essential Words Level 14

inordinate

Essential Words Level 14

inscribe

inscription

insecticide

inshore

insidious

Essential Words Level 6

insightful

Essential Words Level 3

insignificant

Essential Words Level 4

insolvent

instantaneous

Essential Words Level 5

instigate

Essential Words Level 11

instinct

Essential Words Level 13

instinctive

Essential Words Level 13

instrument

instrumental

insulate

insulation

intangible

Essential Words Level 11

integral

Essential Words Level 2

intensify

Essential Words Level 7

intentionally

Essential Words Level 7

intermittent

Essential Words Level 9

internal

Essential Words Level 8

internalize

Essential Words Level 8

interplay

intersperse

Essential Words Level 14

interstellar

intertidal

intervention

Essential Words Level 11

intolerable

Essential Words Level 10

intoxicating

Essential Words Level 14

intricate

Essential Words Level 7

intrigue

Essential Words Level 7

intriguing

Essential Words Level 7

intrinsic

intrusion

Essential Words Level 13

intrusive

Essential Words Level 13

inundate

Essential Words Level 10

invariable

Essential Words Level 9

invariably

Essential Words Level 9

invasive

invertebrate

investigation

Essential Words Level 6

involuntarily

involuntary

ionosphere

irrational

Essential Words Level 8

irregular

Essential Words Level 9

irrigate

irrigation

jurisdiction

justifiable

Essential Words Level 13

justification

Essential Words Level 13

justify

Essential Words Level 13

juxtapose

juxtaposition

karst

Human Body & Health

kinetic

landmass

Human Body & Health

landslide

Human Body & Health

larva

larval

lasting

Essential Words Level 3

lateral

latitude

lava

Human Body & Health

legislation

legitimate

lethal

Essential Words Level 8

life expectancy

Essential Words Level 7

lifespan

Essential Words Level 7

likelihood

Essential Words Level 1

limber

Essential Words Level 14

literate

lithospher

litograph

livelihood

Essential Words Level 7

locomotion

logical

Essential Words Level 8

longevity

Essential Words Level 7

longitude

luminesce

luminescence

luminescent

lunar cycle

lunar eclipse

lurk

Essential Words Level 14

magma

Human Body & Health

magnet

magnetic

magnetism

magnetize

magnetosphere

magnitude

Essential Words Level 4

malaria

malleable

Ecology & Environment

mammal

mammoth

manifest

Essential Words Level 12

manifestation

Essential Words Level 12

manoeuvre

Essential Words Level 14

mantle

Human Body & Health

marginalize

Essential Words Level 14

marsh

Human Body & Health

marsupial

marvel

Essential Words Level 4

mathematical

Essential Words Level 8

medieval

mediocre

Essential Words Level 6

metabolic

metamorphosis

meteor

meteorite

meteoroid

methane

Ecology & Environment

methodical

Essential Words Level 8

microbe

microscope

Ecology & Environment

microscopic

middle class

migrant

migrate

migration

migratory

millenium

millennia

millennium

mimic

mimicry

mineral

Human Body & Health

miniature

minority

Essential Words Level 4

minuscule

Essential Words Level 14

mitigate

Essential Words Level 5

moderate

Essential Words Level 10

molecular

Ecology & Environment

molecule

Ecology & Environment

molten

Human Body & Health

monsoon

monument

morphological

morphologically

mortality

Essential Words Level 7

motif

mound

multifaceted

Essential Words Level 12

mundane

mural

mutation

mutualism

mutualistic

myriad

Essential Words Level 4

myth

Essential Words Level 6

mythology

narrate

narration

narrow

Essential Words Level 3

native

nectar

negligence

Essential Words Level 5

negligible

Essential Words Level 5

neoclassical

neoclassicism

neural

neutrality

Ecology & Environment

neutralized

Ecology & Environment

neutron

Ecology & Environment

nitrogen

Ecology & Environment

nocturnal

nomad

nomadic

nominal

Essential Words Level 14

nonsensical

Essential Words Level 13

noteworthy

Essential Words Level 8

notion

Essential Words Level 8

nouveau-rich

nuance

Essential Words Level 14

nuclear

nucleus

Ecology & Environment

oblige

Essential Words Level 3

oblique

Essential Words Level 13

oblivious

Essential Words Level 13

obscure

obstruct

Essential Words Level 14

occupant

Essential Words Level 6

occupation

Essential Words Level 6

occupational

Essential Words Level 6

occur

Essential Words Level 5

oceanic

octopus

odors

Ecology & Environment

offspring

omit

Essential Words Level 3

omnivore

on account of

Essential Words Level 3

onset

Essential Words Level 9

oppression

optical illusion

orbit

orbital

origin

Essential Words Level 6

originality

Essential Words Level 6

originate

originated

Essential Words Level 6

ornamentation

oscillate

out-of-date

Essential Words Level 4

outcome

Essential Words Level 1

outlaw

outperform

Essential Words Level 7

outweigh

Essential Words Level 6

overcome

Essential Words Level 2

overestimate

Essential Words Level 1

overexpose

Essential Words Level 13

overfish

overflow

overlook

Essential Words Level 3

overshadow

Essential Words Level 13

oversimplify

Essential Words Level 8

oversized

Essential Words Level 3

overtly

Essential Words Level 4

overwhelming

Essential Words Level 7

oviparous

ozone

paradox

Essential Words Level 10

paradoxical

Essential Words Level 10

parallel

Essential Words Level 4

paralysis

paramount

Essential Words Level 2

paraphrase

Essential Words Level 5

parasite

parasitic

parasitism

parliament

participative

Essential Words Level 13

particle

particular

Essential Words Level 3

partisan

pasture

pathogen

peasant

peculiarity

Essential Words Level 12

pediment

perceive

Essential Words Level 9

perceptible

Essential Words Level 9

perception

Essential Words Level 9

perceptive

Essential Words Level 9

perennial

perilous

Essential Words Level 6

periodic

Essential Words Level 7

periodic table

Ecology & Environment

periodical

Essential Words Level 7

permafrost

permeable

Human Body & Health

perpendicular

persistent

Essential Words Level 4

perspective

Essential Words Level 3

pervasive

Essential Words Level 9

pesticide

petition

phenomena

Essential Words Level 6

phenomenon

Essential Words Level 6

philanthropic

Essential Words Level 8

philosophical

Essential Words Level 8

photosynthesis

photosynthetic

physiological

Essential Words Level 8

phytoplankton

pigment

pigmentation

pigmented

pinpoint

Essential Words Level 3

placid

Essential Words Level 10

plague

planet

planetary

plasma

plateau

Human Body & Health

plentiful

Essential Words Level 4

poisonous

polio

poll

pollen

pollinate

pollination

pollinator

pollutant

pollute

pollution

polymer

polyp

popularity

population

porous

Human Body & Health

portrait

portraiture

portray

portrayal

postulate

Essential Words Level 8

potent

Essential Words Level 12

pottery

pouch

practical

Essential Words Level 8

practicality

Essential Words Level 8

practically

Essential Words Level 8

precarious

Essential Words Level 12

precariously

Essential Words Level 12

precariousness

Essential Words Level 12

precaution

Essential Words Level 3

precede

precedent

Essential Words Level 12

precipitate

precipitation

preconception

Essential Words Level 14

precursor

predation

predator

predatory

predecessor

predicament

Essential Words Level 10

predictably

Essential Words Level 3

predominance

Essential Words Level 9

predominant

Essential Words Level 9

predominantly

Essential Words Level 9

predominate

Essential Words Level 9

prefabricate

preferable

Essential Words Level 1

prehistoric

prejudice

Essential Words Level 14

premise

Essential Words Level 8

premolar

presence

present-day

presumably

Essential Words Level 8

prevail

Essential Words Level 9

prevailing

Essential Words Level 9

prevailing wind

prevalence

prevalent

prey

primate

prime

Essential Words Level 3

primitive

prism

privatization

privatize

proclamation

profitability

profoundly

Essential Words Level 4

profuse

Essential Words Level 14

proliferate

Essential Words Level 11

proliferation

Essential Words Level 11

prolific

prolonged

Essential Words Level 11

prominence

prominent

prone

Essential Words Level 6

pronounced

Essential Words Level 10

propaganda

Essential Words Level 14

propagate

Essential Words Level 11

propagation

Essential Words Level 11

prophetic

proponent

Essential Words Level 4

proportional

Essential Words Level 7

propose

Essential Words Level 4

prosperity

Essential Words Level 10

prosperous

Essential Words Level 10

proton

Ecology & Environment

protozoan

provocative

Essential Words Level 11

provoke

Essential Words Level 11

proximity

Essential Words Level 3

psychological

puzzling

Essential Words Level 13

quantity

Essential Words Level 2

quarrel

quintessence

racism

radiant

Essential Words Level 14

radiate

Essential Words Level 14

radiation

radioactive

radiocarbon dating

reaction

Ecology & Environment

reason

Essential Words Level 1

reassure

Essential Words Level 14

recede

Human Body & Health

receptive

Essential Words Level 13

receptor

Essential Words Level 13

reciprocal

Essential Words Level 14

reciprocate

Essential Words Level 13

recover

Essential Words Level 1

recurrent

Essential Words Level 9

redundant

Essential Words Level 8

refine

Ecology & Environment

reflection

Essential Words Level 3

refrain

Essential Words Level 1

regeneration

reign

reinforce

Essential Words Level 12

reject

Essential Words Level 1

relinquish

reluctantly

Essential Words Level 10

remarkable

Essential Words Level 6

renewable

renown

Essential Words Level 5

repel

repellent

Essential Words Level 13

repetitive

Essential Words Level 9

replica

replicate

Essential Words Level 12

reportedly

Essential Words Level 3

reproduce

reproduction

reproductive

reptile

resemblance

Essential Words Level 10

resemble

Essential Words Level 10

resentment

Essential Words Level 14

reservoir

resilient

resin

resonance

resonant

resonate

respiratory

retain

Essential Words Level 4

retina

retrieve

Essential Words Level 2

retrospective

Essential Words Level 12

reveal

Essential Words Level 2

reverberant

reverberate

reverberation

revive

revolutionize

rhythm

Essential Words Level 2

rigid

rigorous

Essential Words Level 14

ritual

ritualization

riveting

Essential Words Level 11

robust

Essential Words Level 12

routinely

Essential Words Level 8

rudimentary

Essential Words Level 14

ruin

ruler

runoff

Human Body & Health

salinization

saliva

salivary

salivation

sarcastic

Essential Words Level 14

satire

Essential Words Level 14

saturate

Ecology & Environment

savanna

scarce

Essential Words Level 4

scarcely

Essential Words Level 4

scarcity

Essential Words Level 4

scattered

Essential Words Level 10

scavenger

scenario

Essential Words Level 2

scenery

Essential Words Level 10

scenic

Essential Words Level 10

scholar

sea anemone

seasonal

Essential Words Level 2

secrete

secular

sedentary

sediment

Human Body & Health

sedimentary

Human Body & Health

seismic

seismicity

selective

Essential Words Level 8

self-pollination

semi-arid

semiconductor

settle

settlement

settler

severe

Essential Words Level 6

severely

Essential Words Level 6

shallow

Essential Words Level 2

sharply

Essential Words Level 5

shed

Essential Words Level 5

sheltered

Essential Words Level 10

shimmer

significance

Essential Words Level 4

significant

Essential Words Level 4

similarity

Essential Words Level 7

situated

Essential Words Level 10

skeptical

Essential Words Level 8

skew

Essential Words Level 14

sloping

Human Body & Health

solar eclipse

solar panel

solid

Essential Words Level 1

solifluction

soloist

solstice

solubility

Ecology & Environment

soluble

Ecology & Environment

solute

Ecology & Environment

solution

Ecology & Environment

solvent

Ecology & Environment

sonar

sonata

spacious

Essential Words Level 10

spanning

Essential Words Level 10

species

spectrum

spike

Essential Words Level 5

spontaneous

Essential Words Level 5

spontaneously

Essential Words Level 5

sporadic

Essential Words Level 7

sprawl

Essential Words Level 10

sprawling

Essential Words Level 10

spur

Essential Words Level 11

stamina

staple

Essential Words Level 10

steady

Essential Words Level 1

stereotype

Essential Words Level 14

sterilize

stigma

stimulant

Essential Words Level 11

stimulate

Essential Words Level 11

stimuli

stimulus

Essential Words Level 11

straightforward

Essential Words Level 1

strategic alliance

stratosphere

streamline

striking

Essential Words Level 10

stringent

Essential Words Level 13

stunt

Essential Words Level 14

sublimate

Ecology & Environment

sublimation

Ecology & Environment

subliminal

submerge

Human Body & Health

submerged

Human Body & Health

subsequently

Essential Words Level 5

subsist

substantial

Essential Words Level 4

subterranean

subvert

successive

succulent

succumb

Essential Words Level 14

suite

sulfur dioxide

Ecology & Environment

sulfuric

Ecology & Environment

summer solstice

superficial

Essential Words Level 12

superior

Essential Words Level 6

supernova

supplement

Essential Words Level 9

supposedly

Essential Words Level 2

surge

Essential Words Level 2

susceptible

Essential Words Level 6

suspect

Essential Words Level 1

sustain

Essential Words Level 5

sustainability

Essential Words Level 5

sustainable

Essential Words Level 5

sustained

Essential Words Level 5

symbiosis

symbiotic

symbol

Essential Words Level 1

symbolic

Essential Words Level 12

symbolize

Essential Words Level 12

synthesis

Ecology & Environment

synthetic

Ecology & Environment

systematic

Essential Words Level 8

systematically

Essential Words Level 8

tablet

take after

Essential Words Level 10

tangible

Essential Words Level 12

tectonic

Human Body & Health

tedious

Essential Words Level 1

temperamental

Essential Words Level 12

tempt

Essential Words Level 1

tentacle

termite

terracing

terrain

terrestrial

theoretically

Essential Words Level 8

therapeutic

thought-provoking

Essential Words Level 11

tidal

timbered

titillating

Essential Words Level 11

trait

Essential Words Level 1

tranquil

Essential Words Level 10

tranquility

Essential Words Level 10

transmission

Essential Words Level 13

traumatic

Essential Words Level 11

treacherous

Essential Words Level 13

tremendous

Essential Words Level 4

tribe

trigger

Essential Words Level 11

triumph

Essential Words Level 6

tundra

turbulent

turmoil

ubiquitous

Essential Words Level 9

ubiquity

Essential Words Level 9

ultraviolet

unanimously

Essential Words Level 13

unbiased

Essential Words Level 12

unconscious

undeniable

Essential Words Level 7

underestimate

Essential Words Level 1

underlie

Human Body & Health

underline

Essential Words Level 5

unearth

unearthly

Essential Words Level 14

uninhabitable

unlikely

Essential Words Level 1

unmanned

unprecedented

Essential Words Level 11

unwarranted

Essential Words Level 12

upheaval

upheld

Essential Words Level 4

uranium

Ecology & Environment

urbanity

vague

Essential Words Level 4

valve

vanishing

vapor

Ecology & Environment

vaporize

Ecology & Environment

variation

Essential Words Level 9

varied

Essential Words Level 9

variety

Essential Words Level 9

various

Essential Words Level 9

varying

Essential Words Level 9

vassal

vast

Essential Words Level 4

vegetation

velocity

venom

venomous

ventilator

ventricle

vertebrate

viable

Essential Words Level 8

vibrant

vibrate

vibration

vicinity

Essential Words Level 10

vigorous

Essential Words Level 14

visibly

Essential Words Level 5

visionary

visualize

Essential Words Level 5

viviparous

volatile

Ecology & Environment

volcanic

Human Body & Health

voltage

vulnerable

Essential Words Level 6

wavelength

weathering

Human Body & Health

weigh in

Essential Words Level 6

weigh on

Essential Words Level 6

wetland

widespread

Essential Words Level 9

winter solstice

withstand

wreak

Essential Words Level 14

yield

Essential Words Level 2

zenith

Essential Words Level 14

zooplankton