captive vs brute

captive and brute both are nouns.

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

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

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

captive (noun)	brute (noun)
an animal that is confined	a living organism characterized by voluntary movement
a person who is confined; especially a prisoner of war	a cruelly rapacious person
a person held in the grip of a strong emotion or passion

captive (adjective)	brute (adjective)
giving or marked by complete attention to	resembling a beast; showing lack of human sensibility
being in captivity