3
agent(noun, plant, spy, operative, informer)
3
beagle
3
betray
3
bloodhound(noun, agent, spy, informer, reporter)
3
cop(noun, agent, spy, informer, reporter)
3
denounce
3
descry
3
dog(verb, pursue)
3
fed(agent, spy, informer, reporter, gumshoe)
3
ferret
3
informer(noun, information, plant, agent, spy)
3
snooper(noun, agent, spy, hound, sneak)
2
grass
2
follow(verb, pursue)
2
hound
2
pursue(verb, pursue)
2
shadow(noun, verb, examine, case, discover)
2
spotter(noun, plant, watch, guard, agent)
2
trail(verb, examine, case, discover, pursue)
1
Sherlock
11 years ago|4.6k views|share |citing 
APASmart Define. (2015). sleuth thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/sleuth/thesaurus/synonyms
ChicagoSmart Define. 2015. "sleuth thesaurus" https://smartdefine.org/sleuth/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2015, sleuth thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/sleuth/thesaurus/synonyms>.
MLASmart Define. "sleuth thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/sleuth/thesaurus/synonyms>