Synonyms|394Antonyms|4|Broader|31Narrower|8Related|173

25 entries under operative topic. ×

1
snoop(noun, plant, agent, informer)
1
spook(noun, plant, agent, informer)
1
spotter(noun, plant, agent, spy)
1
undercover agent(noun, expression, plant, agent)
1
watcher(noun, plant, agent, informer)
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APASmart Define. (2015). sleeper thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/sleeper/thesaurus/synonyms
ChicagoSmart Define. 2015. "sleeper thesaurus" https://smartdefine.org/sleeper/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, sleeper thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/sleeper/thesaurus/synonyms>.
MLASmart Define. "sleeper thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/sleeper/thesaurus/synonyms>