spirit animal vs brute

spirit animal and brute both are nouns.

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

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

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

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

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

spirit animal (adjective)	brute (adjective)
	resembling a beast; showing lack of human sensibility