24
watcher(noun, see, plant, watch, guard)
19
onlooker(noun, person, see, awareness, witness)
17
viewer(noun, witness, fan, slouch, laggard)
16
spectator(noun, person, see, awareness, witness)
15
bystander(noun, person, see, awareness, witness)
15
witness(noun, proof, fan, watcher, spectator)
14
eyewitness(noun, person, witness, fan, testimony)
12
beholder(noun, see, awareness, witness, fan)
11
perceiver(noun, spectator)
7
gazer(noun, spectator)
6
looker-on(noun, see, awareness, witness, fan)
5
looker(noun, spectator)
5
percipient
5
inspector(noun, supervisor)
5
commentator(noun, reporter)
5
spy(noun, person, plant, watch, guard)
4
student(noun, person)
4
watchman(noun, guard)
3
examiner
3
finder
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APASmart Define. (2016). observer thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/observer/thesaurus/synonyms
ChicagoSmart Define. 2016. "observer thesaurus" https://smartdefine.org/observer/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2016, observer thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/observer/thesaurus/synonyms>.
MLASmart Define. "observer thesaurus" 26 February 2016. Web. 20 September 2026. <https://smartdefine.org/observer/thesaurus/synonyms>