127 entries under noun topic. ×
| operative(plant, agent, mole, infiltrator) | |
| overseer | |
| patrol(plant, watch, guard, agent) | |
| performer | |
| plant(agent, operative, informer, mole) | |
| reviewer | |
| rubberneck | |
| scout(plant, watch, guard, agent) | |
| secret agent(expression, plant, agent, operative) | |
| secret service(expression, plant, agent, operative) | |
| sightseer | |
| sleeper(plant, agent, operative, informer) | |
| sleuth(plant, agent, spy, operative) | |
| snoop(plant, agent, spy, operative) | |
| spier | |
| spook(plant, agent, operative, informer) | |
| spotter(plant, watch, guard, agent) | |
| testimony(witness, proof, watcher, spectator) | |
| tracker | |
| undercover agent(expression, plant, agent, operative) |
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| APA | Smart Define. (2016). observer thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/observer/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "observer thesaurus" https://smartdefine.org/observer/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, observer thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/observer/thesaurus/synonyms>. |
| MLA | Smart Define. "observer thesaurus" 26 February 2016. Web. 26 September 2026. <https://smartdefine.org/observer/thesaurus/synonyms> |