Synonyms|34Antonyms|0|Broader|0Narrower|0Related|35
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railroad line(expression, idiom)
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railway
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railway line(expression, idiom)
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railway system(expression, idiom)
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resistance
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subway
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thermionic tube(expression, idiom)
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thermionic vacuum tube(expression, idiom)
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thermionic valve(expression, idiom)
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tube
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tubing
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underground railroad(expression, idiom)
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underpass
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vacuum tube(expression, idiom)
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ChicagoSmart Define. 2013. "undergrounded thesaurus" https://smartdefine.org/undergrounded/thesaurus/synonyms (accessed September 22, 2026).
HarvardSmart Define 2013, undergrounded thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/undergrounded/thesaurus/synonyms>.
MLASmart Define. "undergrounded thesaurus" 19 May 2013. Web. 22 September 2026. <https://smartdefine.org/undergrounded/thesaurus/synonyms>