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espionage(noun, spy, spying)
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APASmart Define. (2013). undercover work thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/undercover_work/thesaurus/synonyms
ChicagoSmart Define. 2013. "undercover work thesaurus" https://smartdefine.org/undercover_work/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2013, undercover work thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/undercover_work/thesaurus/synonyms>.
MLASmart Define. "undercover work thesaurus" 18 May 2013. Web. 22 September 2026. <https://smartdefine.org/undercover_work/thesaurus/synonyms>