- Definitions|2
- Thesaurus|257
- Abbreviations|0
| investigate | |
| keep under surveillance(verb, expression, idiom, examine, case) | |
| look for(verb, expression, examine, case, discover) | |
| lookout(noun, plant, watch, guard, agent) | |
| meddle(verb, examine, case, discover, watch) | |
| messenger | |
| mole(noun, plant, watch, agent, spy) | |
| narc | |
| nark(agent, spy, informer, reporter, gumshoe) | |
| newsmonger | |
| notice(noun, verb, examine, discover, watch) | |
| observe(verb, examine, discover, watch, scrutinize) | |
| observer(noun, plant, agent, spy, operative) | |
| patrol(noun, plant, watch, guard, agent) | |
| peach | |
| peep(verb, examine, discover, watch, scrutinize) | |
| peeper(noun, agent, spy, informer, reporter) | |
| picket(noun, plant, watch, guard, agent) | |
| plainclothes officer(expression, agent, spy, hound, informer) | |
| plainclothesman |
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| APA | Smart Define. (2015). sleuth thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/sleuth/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "sleuth thesaurus" https://smartdefine.org/sleuth/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, sleuth thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/sleuth/thesaurus/synonyms>. |
| MLA | Smart Define. "sleuth thesaurus" 14 April 2015. Web. 22 September 2026. <https://smartdefine.org/sleuth/thesaurus/synonyms> |