7 entries under idiom topic. ×

4
undercover work(noun, expression, spy, sleeper)
0
domiciliary visit(expression, inquiry)
0
espionage activity
0
intelligence agent
0
intelligence officer
0
secret agent
0
secret watching
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APASmart Define. (2015). espionage thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/espionage/thesaurus/synonyms
ChicagoSmart Define. 2015. "espionage thesaurus" https://smartdefine.org/espionage/thesaurus/synonyms (accessed September 23, 2026).
HarvardSmart Define 2015, espionage thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/espionage/thesaurus/synonyms>.
MLASmart Define. "espionage thesaurus" 14 April 2015. Web. 23 September 2026. <https://smartdefine.org/espionage/thesaurus/synonyms>