| sleuth(noun, agent, spy, informer, gumshoe) | |
| private investigator(noun, expression, agent, spy, informer) | |
| detective(noun, investigator) | |
| dick(noun, agent, eye, spy, informer) | |
| operative | |
| private detective(noun, private) | |
| shamus(noun, agent, spy, informer, reporter) | |
| snoop(noun, agent, spy, informer, reporter) | |
| gumshoe(noun, agent, eye, spy, hound) | |
| PI | |
| investigator(noun, person) | |
| tec | |
| P.I.(noun, detective) | |
| eye(agent, spy, informer, reporter, gumshoe) | |
| peeper(noun, agent, spy, informer, reporter) | |
| sherlock | |
| agent(noun, spy, hound, informer, reporter) | |
| beagle | |
| cop(noun, agent, spy, informer, reporter) | |
| flatfoot(agent, eye, spy, informer, reporter) |
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| APA | Smart Define. (2015). private eye thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/private_eye/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "private eye thesaurus" https://smartdefine.org/private_eye/thesaurus/synonyms (accessed September 20, 2026). |
| Harvard | Smart Define 2015, private eye thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/private_eye/thesaurus/synonyms>. |
| MLA | Smart Define. "private eye thesaurus" 13 April 2015. Web. 20 September 2026. <https://smartdefine.org/private_eye/thesaurus/synonyms> |