| betrayer(noun, source, spy, grass, sneak) |
| confess(verb, acknowledge, confirm, admit, sing) |
| informant(noun, law, person, knowledge, source) |
| sneaker |
| stoolpigeon |
| whistle-blower(noun, source, spy, sneak, informer) |
| disclose(verb, declare, acknowledge, confirm, admit) |
| dog(noun, beast, bastard, bounder, bugger) |
| narc(noun, source, grass, sneak, decoy) |
| sing(verb, phrasal verb, law, knowledge, blow) |
| strikebreaker |
| talebearer |
| tattle(verb, law, give, knowledge) |
| blab(verb, sneak, informer, snake, informant) |
| blabbermouth(noun, source, gossip, grass, sneak) |
| blow the whistle(verb, expression, idiom, law, knowledge) |
| grass(noun, sneak, decoy, informer, informant) |
| inform(verb, law, give, knowledge, talk) |
| peach(verb, talk, sing, ratting) |
| ratfink(noun, gossip, sneak, informer, rat) |