| spy(noun, person, information, plant, opposition) |
| betrayer(noun, opposition, source, agent, villain) |
| complainant |
| rat(noun, law, person, knowledge, informal) |
| squealer(noun, law, person, knowledge, slang) |
| stoolie(noun, law, person, knowledge, slang) |
| fink(noun, law, person, knowledge, slang) |
| snitch(noun, law, person, knowledge, slang) |
| nark(noun, source, agent, spy, gossip) |
| sneak(noun, person, source, spy, gossip) |
| tattletale(noun, law, person, knowledge, source) |
| traitor(noun, person, opposition, agent, villain) |
| informant(noun, law, person, knowledge, source) |
| stool pigeon(noun, expression, idiom, law, person) |
| tattler(noun, law, person, knowledge, source) |
| telltale(noun, gossip, rat, canary, snitch) |
| grass(noun, gossip, sneak, decoy, traitor) |
| accuser(noun, accusation, sneak, reporter, informant) |
| canary(noun, source, gossip, grass, sneak) |
| reporter(noun, agent, spy, sneak, messenger) |