| quisling(noun, spy, turncoat, traitor, conspirator) |
| stool pigeon(noun, expression, source, sneak, informer) |
| stoolie(noun, source, grass, sneak, informer) |
| enemy(noun, someone, rival, opponent, competitor) |
| narc(noun, source, grass, sneak, decoy) |
| snitcher(noun, source, spy, grass, sneak) |
| weasel(noun, source, grass, sneak, decoy) |
| archtraitor |
| defector(noun, rebel, spy, criminal, turncoat) |
| double agent(noun, expression, spy, turncoat, conspirator) |
| judas |
| serpent |
| snake(rebel, spy, sneak, informant, squealer) |
| tattletale(source, spy, grass, sneak, informer) |
| whistle-blower(source, spy, grass, sneak, informer) |
| accuser(noun, source, sneak, rat, informant) |
| apostate(noun, rebel, spy, criminal, turncoat) |
| backstabber(noun, informer, rascal, rat, scoundrel) |
| bamboozler |
| beguiler |