68 entries under noun topic. ×

20
spy(verb, person, information, follow)
17
snoop(verb, person, plant, examine)
15
detective(information, plant, watch, investigate)
12
gumshoe(slang, investigate, agent, spy)
12
investigator(person, plant, investigate, agent)
10
dick(slang, investigate, agent, spy)
8
private eye(expression, agent, spy, informer)
8
eye(informal, investigate, agent, spy)
7
private detective(expression, idiom, private, detective)
5
shamus(agent, spy, informer, reporter)
5
sleuthhound
4
eavesdropper(information, agent, spy, scout)
4
operative(plant, agent, mole, gumshoe)
4
private investigator(expression, agent, spy, informer)
4
scout(verb, person, plant, examine)
4
tail(verb, examine, case, discover)
4
tec
3
Hawkshaw
3
P.I.
3
agent(plant, spy, operative, informer)
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APASmart Define. (2015). sleuth thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/sleuth/thesaurus/synonyms
ChicagoSmart Define. 2015. "sleuth thesaurus" https://smartdefine.org/sleuth/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, sleuth thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/sleuth/thesaurus/synonyms>.
MLASmart Define. "sleuth thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/sleuth/thesaurus/synonyms>