136 entries under noun topic. ×
| sleuth(verb, person, information, follow) | |
| undercover agent(expression, idiom, person, plant) | |
| snoop(verb, person, follow, plant) | |
| scout(verb, study, person, consider) | |
| secret agent(expression, idiom, person, plant) | |
| watch(verb, mark, consider, see) | |
| detective(person, information, plant, watch) | |
| spot(verb, mark, consider, see) | |
| espy(verb, mark, consider, see) | |
| notice(verb, mark, consider, see) | |
| operative(person, plant, investigate, radical) | |
| agent(person, plant, opposition, investigate) | |
| informer(person, information, plant, opposition) | |
| infiltrator(person, plant, mole, detective) | |
| investigator(person, plant, agent, shadow) | |
| double agent(expression, idiom, person, plant) | |
| plant(person, informal, source, grass) | |
| spook(person, plant, informal, investigate) | |
| betrayer(opposition, source, agent, villain) | |
| espionage agent(expression, person, plant, mole) |
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| APA | Smart Define. (2016). spy thesaurus. Retrieved September 27, 2026, from https://smartdefine.org/spy/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "spy thesaurus" https://smartdefine.org/spy/thesaurus/synonyms (accessed September 27, 2026). |
| Harvard | Smart Define 2016, spy thesaurus, Smart Define, viewed 27 September, 2026, <https://smartdefine.org/spy/thesaurus/synonyms>. |
| MLA | Smart Define. "spy thesaurus" 10 February 2016. Web. 27 September 2026. <https://smartdefine.org/spy/thesaurus/synonyms> |