| informer(agent, gumshoe, investigator, dick) | |
| nark(agent, police, informer, reporter) | |
| plainclothes officer(expression, agent, police, informer) | |
| police officer(expression, agent, informer, reporter) | |
| prosecutor(agent, police, informer, reporter) | |
| reporter(agent, informer, gumshoe, investigator) | |
| roper(agent, police, informer, reporter) | |
| scout(agent, informer, reporter, gumshoe) | |
| sergeant(agent, police, informer, reporter) | |
| shadow(agent, informer, reporter, gumshoe) | |
| shoofly(agent, police, informer, reporter) | |
| slewfoot(agent, police, informer, reporter) | |
| tail(noun, agent, informer, reporter) |
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| APA | Smart Define. (2015). private investigator thesaurus. Retrieved October 1, 2026, from https://smartdefine.org/private_investigator/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "private investigator thesaurus" https://smartdefine.org/private_investigator/thesaurus/synonyms (accessed October 1, 2026). |
| Harvard | Smart Define 2015, private investigator thesaurus, Smart Define, viewed 1 October, 2026, <https://smartdefine.org/private_investigator/thesaurus/synonyms>. |
| MLA | Smart Define. "private investigator thesaurus" 14 April 2015. Web. 1 October 2026. <https://smartdefine.org/private_investigator/thesaurus/synonyms> |