| sleuth(noun, agent, informer, gumshoe) |
| private investigator(noun, expression, agent, informer) |
| dick(noun, agent, eye, informer) |
| shamus(noun, agent, informer, reporter) |
| snoop(noun, agent, informer, reporter) |
| gumshoe(noun, agent, eye, hound) |
| eye(agent, informer, reporter, gumshoe) |
| peeper(noun, agent, informer, reporter) |
| agent(noun, hound, informer, reporter) |
| cop(noun, agent, informer, reporter) |
| flatfoot(agent, eye, informer, reporter) |
| Sherlock Holmes(expression, agent, informer, gumshoe) |
| analyst(agent, hound, informer, reporter) |
| bird dog(noun, expression, agent, informer) |
| bloodhound(noun, agent, informer, reporter) |
| bull(agent, informer, reporter, gumshoe) |
| constable(noun, agent, informer, reporter) |
| eavesdropper(agent, informer, reporter, gumshoe) |
| fed(agent, informer, reporter, gumshoe) |
| fink(agent, informer, reporter, gumshoe) |