Synonyms|24Antonyms|0|Broader|0Narrower|0Related|2
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slammer(noun, pen, prison, lockup, reformatory)
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statesville(noun, pen, reformatory, penitentiary)
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stockade(noun, pen, prison, lockup, reformatory)
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top-security prison(noun, pen, reformatory, penitentiary)
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APASmart Define. (2013). secure unit thesaurus. Retrieved September 20, 2026, from https://smartdefine.org/secure_unit/thesaurus/synonyms
ChicagoSmart Define. 2013. "secure unit thesaurus" https://smartdefine.org/secure_unit/thesaurus/synonyms (accessed September 20, 2026).
HarvardSmart Define 2013, secure unit thesaurus, Smart Define, viewed 20 September, 2026, <https://smartdefine.org/secure_unit/thesaurus/synonyms>.
MLASmart Define. "secure unit thesaurus" 18 May 2013. Web. 20 September 2026. <https://smartdefine.org/secure_unit/thesaurus/synonyms>