8
watching(verb, seeing, voyeurism, espionage)
7
detection
6
espial(noun, espionage)
6
undercover work(noun, expression, idiom, pursuance, meddling)
5
espionage
5
spotting(noun, verb)
5
catching
5
observing(verb, watching, seeing, voyeurism)
5
snooping(noun, verb, adjective, pursuance, meddling)
5
surveillance(noun, scrutiny, investigation, following, shadowing)
5
viewing(noun, verb, watching, seeing, voyeurism)
4
intelligence
4
looking(verb, seeing)
4
perceiving(verb, seeing)
4
shadowing(noun, verb, scrutiny, investigation)
4
sighting(noun, verb, seeing)
3
discerning(verb, adjective, seeing)
3
glimpsing(verb, seeing)
3
nosy
3
peeking(verb, seeing)
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APASmart Define. (2015). spying thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/spying/thesaurus/synonyms
ChicagoSmart Define. 2015. "spying thesaurus" https://smartdefine.org/spying/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, spying thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/spying/thesaurus/synonyms>.
MLASmart Define. "spying thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/spying/thesaurus/synonyms>