brigand vs stealer

brigand and stealer both are nouns.

Word	Noun	Adjective	Verb	Adverb
brigand	Yes	No	No	No
stealer	Yes	No	No	No

As nouns, stealer is a hypernym of brigand; that is, stealer is a word with a broader meaning than brigand:

brigand: an armed thief who is (usually) a member of a band
stealer: a criminal who takes property belonging to someone else with the intention of keeping it or selling it

Other hypernyms of brigand include thief.

brigand (noun)	stealer (noun)
an armed thief who is (usually) a member of a band	a criminal who takes property belonging to someone else with the intention of keeping it or selling it