12 entries under expression topic. ×
| undercover work(noun, idiom, spy, sleeper) | |
| domiciliary visit(idiom, inquiry) | |
| espionage activity | |
| espionage agent(noun, spy, sleeper) | |
| industrial espionage | |
| intelligence agent | |
| intelligence gathering(noun, spying) | |
| intelligence officer | |
| phone tapping(noun, spying) | |
| secret agent | |
| secret watching | |
| undercover activities |
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| APA | Smart Define. (2015). espionage thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/espionage/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "espionage thesaurus" https://smartdefine.org/espionage/thesaurus/synonyms (accessed September 21, 2026). |
| Harvard | Smart Define 2015, espionage thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/espionage/thesaurus/synonyms>. |
| MLA | Smart Define. "espionage thesaurus" 14 April 2015. Web. 21 September 2026. <https://smartdefine.org/espionage/thesaurus/synonyms> |