| squealer(source, spy, grass, sneak, informer) |
| stool pigeon(noun, expression, source, spy, sneak) |
| stoolie(noun, source, grass, sneak, decoy) |
| tattler(source, grass, sneak, decoy, informer) |
| tattletale(source, spy, grass, sneak, informer) |
| timeserver |
| tipster(source, grass, sneak, decoy, informer) |
| treasonist(spy, impostor, renegade, turncoat, hypocrite) |
| trickster(crook, rascal, rogue, cheater, double-dealer) |
| whistle-blower(source, spy, grass, sneak, informer) |
| swindler(crook, rascal, rogue, trickster, cheater) |
| blab(sneak, informant, squealer) |
| blabber |
| cheater(trickster, double-dealer) |
| collaborator(spy, turncoat, conspirator) |
| con man(expression, trickster, cheater, double-dealer) |
| fat mouth(expression, sneak, informant, squealer) |
| fifth-columnist |
| finger(sneak, informant, squealer) |
| fork tongue(expression, sneak, informant, squealer) |