1
snoop(noun, plant, agent, operative, informer)
1
snooper
1
spacer
1
specker
1
speckler
1
spier
1
spook(noun, plant, agent, operative, informer)
1
spy-catcher
1
spy plane
1
stationer
1
tainter
1
ticker
1
undercover agent(noun, expression, plant, watch, agent)
1
undercover man
1
vedette
1
vigil(noun, case, watch, guard, post)
1
ward(noun, case, watch, guard, sentry)
1
warden
1
watch person watchtower(noun, expression, idiom, case, watch)
0
acquirer
11 years ago|7.3k views|share |citing 
APASmart Define. (2015). spotter thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/spotter/thesaurus/synonyms
ChicagoSmart Define. 2015. "spotter thesaurus" https://smartdefine.org/spotter/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, spotter thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/spotter/thesaurus/synonyms>.
MLASmart Define. "spotter thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/spotter/thesaurus/synonyms>