| betrayer(noun, source, spy, sneak, informer) |
| double-crosser(noun, source, spy, sneak, informer) |
| informer(noun, source, spy, grass, sneak) |
| Benedict Arnold(noun, expression, spy, renegade) |
| spy(noun, grass, decoy, informer) |
| fink(noun, source, spy, grass, sneak) |
| sneak(noun, informal, source, spy, grass) |
| snitch(noun, source, spy, grass, sneak) |
| squealer(noun, source, spy, grass, sneak) |
| backstabber(informer, rascal, scoundrel, swine) |
| narc(source, grass, sneak, decoy, informer) |
| nark(source, grass, sneak, decoy, informer) |
| snitcher(source, spy, grass, sneak, decoy) |
| tattletale(noun, source, spy, grass, sneak) |
| whistle-blower(noun, source, spy, grass, sneak) |
| deceiver(noun, source, spy, sneak, informer) |