Agent
Agent noun - Something used to achieve an end.
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Synonyms for Agent
Fifth columnist and agent are semantically related. in spy topic. In some cases you can use "Fifth columnist" instead a noun "Agent".
Fifth columnist
Fifth columnist noun - A member of a clandestine subversive organization who tries to help a potential invader.
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Synonyms for Fifth columnist
Agent and fifth columnist are semantically related. Sometimes you can replace term "Agent" with "Fifth columnist", this terms are similar.
Mutual synonyms
Cite this Source
Fifth columnist and Agent. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/agent/fifth_columnist
Agent & Fifth columnist. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/agent/fifth_columnist>.
Fifth columnist or Agent. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/agent/fifth_columnist.
Google Ngram Viewer shows how "agent" and "fifth columnist" have occurred on timeline