Oubliette
Oubliette noun - A dungeon with the only entrance or exit being a trap door in the ceiling.
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Synonyms for Oubliette
Prison
Prison noun - A place of confinement for persons held in lawful custody.
Usage example: the ongoing debate whether drug users should go to prison
Mutual synonyms
Both words in one sentence
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A fun word for a prison of this type is "oubliette" where a prisoner would be thrown to be literally forgotten about (from "oublier" = "to forget").
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Sealed Evil in a Can: Gorea was trapped inside a prison called the Seal Sphere, and then that was placed inside a larger prison called the Oubliette, which was then sent into subspace.
- While also a prison, the Oubliette from Metroid Prime: Hunters, although it gets pulled back to normal space so that you can fight the Final Boss inside it.
Source: Ominous Floating Castle
Cite this Source
Prison and Oubliette. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/oubliette/prison
Oubliette & Prison. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/oubliette/prison>.
Prison or Oubliette. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/oubliette/prison.
Google Ngram Viewer shows how "oubliette" and "prison" have occurred on timeline