Synonyms for Snitch (same or very similar meaning)
WordNet sense 1 (someone acting as an informer or decoy for the police):
canary, fink, sneaker, sneak, snitcher, stoolie, stoolpigeon, stool pigeonWordNet sense 2 (take by theft):
cop, hook, thieve, glom, knock offWordNet sense 3 (give away information about somebody):
betray, denounce, grass, rat, shit, shop, stag, give away, tell onFrom the ODE community, based on WordNetadd/edit