exist
The verb "exist" means to live, to have reality. It's not only "live" things that exist. The government exists, as does your fear of heights. Anything that can be acknowledged in the present exists. Another meaning for the verb exists is to support oneself or survive. If someone doesn't have a job, they may have to exist on unemployment benefits until they find one.
Let’s take a look at some sentences where the verb "exist" means to live, to have reality:
In the last sentence: Those ideas only exist in your mind; means that the ideas are only in your mind.
Now, here are some example sentences where the verb "exist" means to support oneself or survive. It is used with the preposition "on":
This sentence means that the individual’s wage is not enough to survive on or support oneself. He/she may have to find a better job which pays higher wages to survive on or support himself/herself.
This sentence means that villVillagers survived on rainwater in the jungle. You can also use "subsist on".