stoolie

a person who provides information about another's wrongdoing told the mule that if he ever turned stoolie, he'd end up spilling his guts in more ways than one Synonyms betrayer, canary [slang], deep throat, fink, informant, nark [British], rat, rat fink, snitch, snitcher, squealer, informer, stool pigeon, talebearer, tattler, tattletale, telltale, whistle-blowerRelated Words collaborator; blabber, blabbermouth, gossip, gossiper, leaker; snoop, snooper, spy; notifier