Sleeper
Sleeper noun - A spy or saboteur or terrorist planted in an enemy country who lives there as a law-abiding citizen until activated by a prearranged signal.
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Synonyms for Sleeper
Terrorist and sleeper are semantically related. In some cases you can use "Terrorist" instead a noun "Sleeper".
Terrorist
Terrorist noun - A radical who employs terror as a political weapon; usually organizes with other terrorists in small cells; often uses religion as a cover for terrorist activities.
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Synonyms for Terrorist
Sleeper and terrorist are semantically related. Sometimes you can replace term "Sleeper" with "Terrorist", this nouns are similar.
Both words in one sentence
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Grant Red Herring: There is a terrorist sleeper agent hiding among the passengers with a remote detonator to the bomb.
Source: Film / Executive Decision
Cite this Source
Terrorist and Sleeper. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/sleeper/terrorist
Sleeper & Terrorist. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/sleeper/terrorist>.
Terrorist or Sleeper. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/sleeper/terrorist.
Google Ngram Viewer shows how "sleeper" and "terrorist" have occurred on timeline