| Sherlock Holmes(noun, expression, agent, spy, police) |
| bird dog(noun, expression, agent, spy, police) |
| detective(noun, police, gumshoe, investigator, dick) |
| plainclothes officer(noun, expression, agent, spy, police) |
| private investigator(noun, expression, agent, spy, police) |
| agent(spy, informer, reporter, gumshoe, investigator) |
| analyst(agent, spy, informer, reporter, gumshoe) |
| bloodhound(noun, agent, spy, police, informer) |
| bull(agent, spy, informer, reporter, gumshoe) |
| constable(noun, agent, spy, informer, reporter) |
| cop(noun, agent, spy, informer, reporter) |
| copper(noun, police, roper) |
| dick(noun, agent, spy, police, informer) |
| eavesdropper(agent, spy, informer, reporter, gumshoe) |
| eye(agent, spy, informer, reporter, gumshoe) |
| fed(agent, spy, police, informer, reporter) |
| fink(agent, spy, informer, reporter, gumshoe) |
| flatfoot(noun, agent, spy, police, informer) |
| gumshoe(agent, spy, informer, reporter, investigator) |
| informer(agent, spy, gumshoe, investigator, dick) |