Fifth column
Fifth column noun - A subversive group that supports the enemy and engages in espionage or sabotage; an enemy in your midst.
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Synonyms for Fifth column
Underground and fifth column are semantically related. in secret or subversive group topic. In some cases you can use "Underground" instead a noun phrase "Fifth column".
Underground
Underground noun - A secret organization in a conquered country fighting against enemy forces.
Fifth column and underground are semantically related. You can use "Fifth column" instead a noun "Underground".
Mutual synonyms
Both terms in one sentence
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The Cobra-wannabe Council (formerly the Fifth Column) generally base themselves in converted caves, as do the Rikti, and even the evil cultist Circle of Thorns have their ancient underground city.
Source: Elaborate Underground Base -
The Fifth Column, one of the original villain groups in City of Heroes, were Nazis who'd been underground in the US since being sent there to strike from within during World War II.
Source: Ghostapo
Cite this Source
Underground and Fifth column. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/fifth_column/underground
Fifth column & Underground. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/fifth_column/underground>.
Underground or Fifth column. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/fifth_column/underground.
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