27 entries under infiltrator topic. ×

20
spy(noun, verb, person, information, follow)
17
snoop(noun, verb, person, plant, examine)
15
detective(noun, information, plant, watch, investigate)
12
investigator(noun, person, plant, investigate, agent)
4
operative(noun, plant, agent, mole, gumshoe)
4
scout(noun, verb, person, plant, examine)
3
agent(noun, plant, spy, operative, informer)
3
informer(noun, information, plant, agent, spy)
2
spotter(noun, plant, watch, guard, agent)
1
double agent(noun, expression, plant, agent, spy)
1
emissary(noun, plant, watch, agent, spy)
1
espionage agent(noun, expression, plant, agent, operative)
1
foreign agent(noun, expression, plant, agent, operative)
1
inside agent(noun, expression, plant, agent, operative)
1
intelligencer(noun, plant, agent, operative, informer)
1
lookout(noun, plant, watch, guard, agent)
1
mole(noun, plant, watch, agent, spy)
1
observer(noun, plant, agent, spy, operative)
1
patrol(noun, plant, watch, guard, agent)
1
picket(noun, plant, watch, guard, agent)
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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>