127 entries under noun topic. ×

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agent(plant, operative, informer, mole)
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voyeur
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adopter
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announcer
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attender
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attestor(witness, proof, testimony, watcher)
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chancer
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checker
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corroborator(witness, proof, testimony, watcher)
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couch potato
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declarer
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defender
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deponent(witness, proof, testimony, watcher)
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describer
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discloser
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evidence
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experiencer
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exposer
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eyer
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handler
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APASmart Define. (2016). observer thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/observer/thesaurus/synonyms
ChicagoSmart Define. 2016. "observer thesaurus" https://smartdefine.org/observer/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2016, observer thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/observer/thesaurus/synonyms>.
MLASmart Define. "observer thesaurus" 26 February 2016. Web. 25 September 2026. <https://smartdefine.org/observer/thesaurus/synonyms>