| private eye(noun, expression, agent, spy, informer) |
| operative |
| private detective(noun, gumshoe, investigator, detective, dick) |
| sleuth(noun, agent, spy, informer, reporter) |
| PI(noun, eye, police, gumshoe, detective) |
| detective(noun, police, gumshoe, investigator, dick) |
| shamus(noun, agent, spy, police, informer) |
| snoop(noun, agent, spy, informer, reporter) |
| fed(agent, spy, police, informer, reporter) |
| bird dog(noun, expression, agent, spy, police) |
| dick(noun, agent, eye, spy, informer) |
| gumshoe(noun, agent, eye, spy, informer) |
| peeper(noun, agent, spy, police, informer) |
| sherlock |
| Sherlock Holmes(expression, agent, spy, informer, gumshoe) |
| agent(noun, spy, informer, reporter, gumshoe) |
| analyst(agent, spy, informer, reporter, gumshoe) |
| beagle |
| bloodhound(noun, agent, spy, police, informer) |
| bull(agent, spy, informer, reporter, gumshoe) |