snitch

nouns

someone acting as an informer or decoy for the police

canary, fink, sneak, sneaker, snitch, snitcher, stool pigeon, stoolie, stoolpigeon

take by theft

"Someone snitched my wallet!"

cop, glom, hook, knock off, snitch, thieve

is derived from

give away information about somebody

"He told on his classmate who had cheated on the exam"

betray, denounce, give away, grass, rat, shit, shop, snitch, stag, tell on

is derived from