14 entries under noun topic. ×

4
spying
2
espionage(spy, sleeper, spying)
1
surveillance
0
detection
0
eavesdropping
0
espial
0
following
0
infiltration
0
intelligence
0
intelligence work
0
secret service
0
snooping(pursuance, meddling, officiousness)
0
voyeurism
0
wiretapping
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APASmart Define. (2013). undercover work thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/undercover_work/thesaurus/synonyms
ChicagoSmart Define. 2013. "undercover work thesaurus" https://smartdefine.org/undercover_work/thesaurus/synonyms (accessed September 27, 2026).
HarvardSmart Define 2013, undercover work thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/undercover_work/thesaurus/synonyms>.
MLASmart Define. "undercover work thesaurus" 18 May 2013. Web. 27 September 2026. <https://smartdefine.org/undercover_work/thesaurus/synonyms>