| informer(noun, law, person, knowledge, source) |
| rat(noun, law, knowledge, informal, source) |
| snitch(noun, law, knowledge, slang, source) |
| fink(noun, law, knowledge, slang, source) |
| betrayer(noun, source, spy, grass, sneak) |
| stool pigeon(noun, expression, idiom, law, knowledge) |
| stoolie(noun, law, knowledge, slang, source) |
| tattletale(noun, law, person, knowledge, source) |
| spy(grass, sneak, decoy, informer, informant) |
| traitor(noun, person, spy, rascal, scoundrel) |
| blabber |
| canary(noun, source, gossip, sneak, informer) |
| nark(noun, source, gossip, sneak, informer) |
| pig |
| tattler(noun, law, person, knowledge, source) |
| complainant |
| grass(noun, gossip, sneak, decoy, informer) |
| snitcher(noun, law, knowledge, slang, source) |
| blabbermouth(noun, source, gossip, much, informer) |
| grunter |