2
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1
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1
auditor
1
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1
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1
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1
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1
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1
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1
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1
informer(agent, spy, gumshoe, investigator, detective)
1
inquiry agent
1
inspector(noun, examiner)
1
nark(agent, spy, informer, reporter, gumshoe)
1
plainclothes officer(expression, agent, spy, hound, informer)
1
police officer(expression, agent, spy, monitor, informer)
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private dick
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APASmart Define. (2015). private eye thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/private_eye/thesaurus/synonyms
ChicagoSmart Define. 2015. "private eye thesaurus" https://smartdefine.org/private_eye/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, private eye thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/private_eye/thesaurus/synonyms>.
MLASmart Define. "private eye thesaurus" 13 April 2015. Web. 23 September 2026. <https://smartdefine.org/private_eye/thesaurus/synonyms>