stool-pigeon (noun) stool pigeon: informer to police
Sinonime: agent provocateur, betrayer, blabbermouth, canary, decoy, deep throat, double-crosser, fink, fink, informant, informer, narc, narc, nark, nark,
plant, police informer, rat, rat fink, rat, shill,
sneak, snitch, snitcher,
source,
spy, squealer, squealer, stoolie, stoolie, tattler, tattletale, tipster, turncoat, weasel, whistle-blower