essential vs requisite

essential and requisite both are nouns.

Word	Noun	Adjective	Verb	Adverb
essential	Yes	Yes	No	No
requisite	Yes	Yes	No	No

As nouns, essential and requisite are synonyms defined as:

Other synonyms of essential include necessary, necessity, requirement.

essential (noun)	requisite (noun)
anything indispensable	anything indispensable

essential (adjective)	requisite (adjective)
basic and fundamental	necessary for relief or supply
defining rights and duties as opposed to giving the rules by which rights and duties are established
being or relating to or containing the essence of a plant etc
of the greatest importance
absolutely necessary; vitally necessary