bandit vs stealer

bandit and stealer both are nouns.

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

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

bandit: 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 bandit include thief.

bandit (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