varmint vs brute

varmint and brute both are nouns.

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

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

varmint: any usually predatory wild animal considered undesirable; e.g., coyote
brute: a living organism characterized by voluntary movement

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

varmint (noun)	brute (noun)
any usually predatory wild animal considered undesirable; e.g., coyote	a living organism characterized by voluntary movement
an irritating or obnoxious person	a cruelly rapacious person

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