snitcher vs stealer

snitcher and stealer both are nouns.

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

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

snitcher: a thief who steals without using violence
stealer: a criminal who takes property belonging to someone else with the intention of keeping it or selling it

Other hypernyms of snitcher include thief.

snitcher (noun)	stealer (noun)
someone acting as an informer or decoy for the police	a criminal who takes property belonging to someone else with the intention of keeping it or selling it
a thief who steals without using violence