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