| spotter | |
| Hawkshaw | |
| Sherlock Holmes(expression, agent, spy, informer, gumshoe) | |
| analyst(agent, spy, hound, informer, reporter) | |
| auditor | |
| bird dog(noun, expression, agent, spy, informer) | |
| bloodhound(noun, agent, spy, informer, reporter) | |
| bull(agent, spy, informer, reporter, gumshoe) | |
| constable(noun, agent, spy, informer, reporter) | |
| eavesdropper(agent, spy, informer, reporter, gumshoe) | |
| examiner | |
| fed(agent, spy, informer, reporter, gumshoe) | |
| fink(agent, spy, informer, reporter, gumshoe) | |
| informer(agent, spy, gumshoe, investigator, detective) | |
| inquiry agent | |
| inspector(noun, examiner) | |
| nark(agent, spy, informer, reporter, gumshoe) | |
| plainclothes officer(expression, agent, spy, hound, informer) | |
| police officer(expression, agent, spy, monitor, informer) | |
| private dick |
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| APA | Smart Define. (2015). private eye thesaurus. Retrieved September 23, 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 23, 2026). |
| Harvard | Smart Define 2015, private eye thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/private_eye/thesaurus/synonyms>. |
| MLA | Smart Define. "private eye thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/private_eye/thesaurus/synonyms> |