47 entries under noun topic. ×

7
detection
6
espial
6
undercover work(expression, idiom, pursuance, meddling)
5
espionage
5
spotting
5
catching
5
snooping(verb, adjective, pursuance, meddling)
5
surveillance(scrutiny, investigation, following, shadowing)
5
viewing(verb, watching, seeing, voyeurism)
4
intelligence
4
shadowing(verb, scrutiny, investigation)
4
sighting(verb, seeing)
3
secret service
3
tailing(verb, scrutiny, investigation, shadowing)
2
intelligence work
2
spy
1
discovery
1
eavesdropping
1
monitoring
1
planting
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APASmart Define. (2015). spying thesaurus. Retrieved September 28, 2026, from https://smartdefine.org/spying/thesaurus/synonyms
ChicagoSmart Define. 2015. "spying thesaurus" https://smartdefine.org/spying/thesaurus/synonyms (accessed September 28, 2026).
HarvardSmart Define 2015, spying thesaurus, Smart Define, viewed 28 September, 2026, <https://smartdefine.org/spying/thesaurus/synonyms>.
MLASmart Define. "spying thesaurus" 14 April 2015. Web. 28 September 2026. <https://smartdefine.org/spying/thesaurus/synonyms>