brute vs bestial

brute is a noun but bestial is not a noun.

Word	Noun	Adjective	Verb	Adverb
brute	Yes	Yes	No	No
bestial	No	Yes	No	No

As adjectives, brute and bestial are synonyms defined as:

brute and bestial: resembling a beast; showing lack of human sensibility

Other synonyms of brute include beastly, brutal, brutish.

brute (noun)	bestial (noun)
a living organism characterized by voluntary movement
a cruelly rapacious person

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