herbivore vs beast

herbivore and beast both are nouns.

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

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

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

herbivore (noun)	beast (noun)
any animal that feeds chiefly on grass and other plants	a living organism characterized by voluntary movement
	a cruelly rapacious person