| packer |
| peeper(noun, agent, spy, police, informer) |
| police officer(expression, agent, spy, informer, reporter) |
| private eye(expression, agent, spy, informer, reporter) |
| prosecutor(noun, agent, spy, police, informer) |
| puncher |
| reporter(agent, spy, informer, gumshoe, investigator) |
| roomer |
| scout(agent, spy, informer, reporter, gumshoe) |
| sergeant(noun, agent, spy, police, informer) |
| shadow(agent, spy, informer, reporter, gumshoe) |
| shamus(noun, agent, spy, police, informer) |
| shoofly(noun, agent, spy, police, informer) |
| sleuth(agent, spy, informer, reporter, gumshoe) |
| slewfoot(noun, agent, spy, police, informer) |
| snoop(agent, spy, informer, reporter, gumshoe) |
| spy(agent, informer, reporter, gumshoe, investigator) |
| strander |
| tail(agent, spy, informer, reporter, gumshoe) |
| threader |