1
scrutator(noun, person, search, first)
1
secret agent(noun, expression, plant, agent, operative)
1
secret service(noun, expression, plant, agent, operative)
1
shepherd(noun, keeper, herdsman)
1
sidewalk superintendent
1
sightseer(noun, spectator)
1
signatory(noun, witness, proof, testimony, observer)
1
signer(noun, witness, proof, testimony, observer)
1
sleeper(noun, plant, agent, operative, informer)
1
sleuth(noun, plant, agent, operative, informer)
1
smasher
1
snoop(noun, plant, agent, operative, informer)
1
spectatress
1
spectatrix
1
spier
1
spook(noun, plant, agent, operative, informer)
1
starer
1
studier
1
stunner
1
sweetheart
11 years ago|6.3k views|share |citing 
APASmart Define. (2015). watcher thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/watcher/thesaurus/synonyms
ChicagoSmart Define. 2015. "watcher thesaurus" https://smartdefine.org/watcher/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2015, watcher thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/watcher/thesaurus/synonyms>.
MLASmart Define. "watcher thesaurus" 14 April 2015. Web. 20 September 2026. <https://smartdefine.org/watcher/thesaurus/synonyms>