- Definitions|1
- Thesaurus|40
- Abbreviations|0
| observer(noun, plant, agent, operative, informer) | |
| patrol(noun, plant, agent, operative, informer) | |
| picket(noun, plant, agent, operative, informer) | |
| plant(noun, agent, spy, operative, informer) | |
| secret service(noun, expression, plant, agent, operative) | |
| sleeper(noun, plant, agent, spy, operative) | |
| sleuth(noun, plant, agent, operative, informer) | |
| snoop(noun, plant, agent, operative, informer) | |
| spook(noun, plant, agent, operative, informer) | |
| undercover agent(noun, expression, plant, agent, operative) | |
| watcher(noun, plant, agent, operative, informer) | |
| agent(noun, plant, operative, informer, mole) | |
| counterspy | |
| espionage | |
| infiltrator(noun, plant, spy, mole) | |
| undercover man |
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| APA | Smart Define. (2015). espionage agent thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/espionage_agent/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "espionage agent thesaurus" https://smartdefine.org/espionage_agent/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, espionage agent thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/espionage_agent/thesaurus/synonyms>. |
| MLA | Smart Define. "espionage agent thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/espionage_agent/thesaurus/synonyms> |