| plainclothes officer(expression, agent, informer, reporter) |
| police officer(expression, agent, informer, reporter) |
| private eye(expression, agent, informer, reporter) |
| private investigator(expression, agent, informer, reporter) |
| prosecutor(agent, informer, reporter, gumshoe) |
| quisling(impostor, renegade, turncoat, hypocrite) |
| rebel(turncoat, conspirator) |
| reporter(agent, sneak, informer, informant) |
| roper(agent, informer, reporter, gumshoe) |
| scout(agent, informer, reporter, gumshoe) |
| sergeant(agent, informer, reporter, gumshoe) |
| shadow(agent, informer, reporter, gumshoe) |
| shamus(agent, informer, reporter, gumshoe) |
| shoofly(agent, informer, reporter, gumshoe) |
| sleuth(agent, informer, reporter, gumshoe) |
| slewfoot(agent, informer, reporter, gumshoe) |
| tail(agent, informer, reporter, gumshoe) |
| traducer(impostor, renegade, turncoat, hypocrite) |
| treasonist(impostor, renegade, turncoat, hypocrite) |
| two-timer(impostor, renegade, turncoat, hypocrite) |