mutant vs beast

mutant and beast both are nouns.

Word	Noun	Adjective	Verb	Adverb
mutant	Yes	Yes	No	No
beast	Yes	No	No	No

As nouns, beast is a hypernym of mutant; that is, beast is a word with a broader meaning than mutant:

Other hypernyms of mutant include animal, animate being, brute, creature, fauna.

mutant (noun)	beast (noun)
an animal that has undergone mutation	a living organism characterized by voluntary movement
(biology) an organism that has characteristics resulting from chromosomal alteration	a cruelly rapacious person

mutant (adjective)	beast (adjective)
tending to undergo or resulting from mutation