young vs animal

young and animal both are nouns.

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

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

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

young (noun)	animal (noun)
any immature animal	a living organism characterized by voluntary movement
young people collectively

young (adjective)	animal (adjective)
(used of living things especially persons) in an early period of life or development or growth	marked by the appetites and passions of the body
(of crops) harvested at an early stage of development; before complete maturity
not tried or tested by experience
being in its early stage
suggestive of youth; vigorous and fresh