adult vs animal

adult and animal both are nouns.

Word	Noun	Adjective	Verb	Adverb
adult	Yes	Yes	No	No
animal	Yes	Yes	No	No

As nouns, animal is a hypernym of adult; that is, animal is a word with a broader meaning than adult:

Other hypernyms of adult include animate being, beast, brute, creature, fauna.

adult (noun)	animal (noun)
any mature animal	a living organism characterized by voluntary movement
a fully developed person from maturity onward

adult (adjective)	animal (adjective)
(of animals) fully developed	marked by the appetites and passions of the body
designed to arouse lust