brute vs beastly

brute is a noun but beastly is not a noun.

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

As adjectives, brute and beastly are synonyms defined as:

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

Other synonyms of brute include bestial, brutal, brutish.

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

brute (adjective)	beastly (adjective)
resembling a beast; showing lack of human sensibility	resembling a beast; showing lack of human sensibility
	(informal) very unpleasant

brute (adverb)	beastly (adverb)
	in a beastly manner