spirit animal vs beast

spirit animal and beast both are nouns.

Word	Noun	Adjective	Verb	Adverb
spirit animal	Yes	No	No	No
beast	Yes	No	No	No

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

spirit animal: An animal whose characteristics match a part of a person's behavior
beast: a living organism characterized by voluntary movement

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

spirit animal (noun)	beast (noun)
An animal whose characteristics match a part of a person's behavior	a living organism characterized by voluntary movement
	a cruelly rapacious person