snitcher vs thief

snitcher and thief both are nouns.

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

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

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

Other hypernyms of snitcher include stealer.

snitcher (noun)	thief (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