| detective(noun, plant, agent, operative, informer) | |
| double agent(noun, expression, plant, agent, operative) | |
| electronic surveillance | |
| emissary(noun, plant, agent, operative, mole) | |
| espial | |
| espionage agent(noun, expression, plant, agent, operative) | |
| following | |
| foreign agent(noun, expression, plant, agent, operative) | |
| informer(noun, plant, agent, operative, mole) | |
| inside agent(noun, expression, plant, agent, operative) | |
| intel(noun, expression, information, intelligence, data) | |
| intelligence bureau | |
| intelligencer(noun, plant, agent, spy, operative) | |
| investigator(noun, plant, agent, operative, informer) | |
| lookout(noun, plant, agent, operative, informer) | |
| military intelligence | |
| mole(noun, plant, agent, operative, informer) | |
| naval intelligence | |
| observation | |
| observer(noun, plant, agent, operative, informer) |
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| APA | Smart Define. (2015). secret service thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/secret_service/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "secret service thesaurus" https://smartdefine.org/secret_service/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, secret service thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/secret_service/thesaurus/synonyms>. |
| MLA | Smart Define. "secret service thesaurus" 14 April 2015. Web. 26 September 2026. <https://smartdefine.org/secret_service/thesaurus/synonyms> |