56 entries under noun topic. ×

11
intelligence
9
espial(surveillance, spying, snooping)
9
spying
8
reconnaissance(inspection, inquiry, spying)
6
surveillance(intelligence, inspection, spying, snooping)
4
undercover work(expression, idiom, spy, sleeper)
2
secret service
2
bugging
2
following(surveillance, snooping)
2
intelligence work
2
overview
2
reconnoiter
1
shadowing
1
tailing
1
voyeurism(inspection, surveillance, snooping)
1
wiretapping(surveillance, snooping)
1
examination
1
inspection
1
oversight
1
preview
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APASmart Define. (2015). espionage thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/espionage/thesaurus/synonyms
ChicagoSmart Define. 2015. "espionage thesaurus" https://smartdefine.org/espionage/thesaurus/synonyms (accessed September 26, 2026).
HarvardSmart Define 2015, espionage thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/espionage/thesaurus/synonyms>.
MLASmart Define. "espionage thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/espionage/thesaurus/synonyms>