brute vs assaulter

brute and assaulter both are nouns.

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

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

Other hypernyms of brute include aggressor, assailant, attacker.

brute (noun)	assaulter (noun)
a living organism characterized by voluntary movement	someone who attacks
a cruelly rapacious person

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