127 entries under noun topic. ×
| detective(plant, watch, guard, agent) | |
| detector | |
| determinist | |
| discoverer | |
| distinguisher | |
| double agent(expression, plant, agent, operative) | |
| emissary(plant, agent, operative, mole) | |
| espionage agent(expression, plant, agent, operative) | |
| foreign agent(expression, plant, agent, operative) | |
| gawker(witness, proof, testimony, watcher) | |
| hearer | |
| imparter | |
| informer(plant, agent, operative, mole) | |
| inside agent(expression, plant, agent, operative) | |
| intelligencer(plant, agent, operative, informer) | |
| maintainer | |
| marker | |
| minder | |
| mole(plant, agent, operative, informer) | |
| non-participant |
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| APA | Smart Define. (2016). observer thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/observer/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "observer thesaurus" https://smartdefine.org/observer/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, observer thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/observer/thesaurus/synonyms>. |
| MLA | Smart Define. "observer thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/observer/thesaurus/synonyms> |