Synonyms|34Antonyms|0|Broader|0Narrower|0Related|35

9 entries under idiom topic. ×

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electron tube
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railroad line
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railway line
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railway system
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thermionic tube
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thermionic vacuum tube
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thermionic valve
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underground railroad
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vacuum tube
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APASmart Define. (2013). undergrounding thesaurus. Retrieved September 21, 2026, from https://smartdefine.org/undergrounding/thesaurus/synonyms
ChicagoSmart Define. 2013. "undergrounding thesaurus" https://smartdefine.org/undergrounding/thesaurus/synonyms (accessed September 21, 2026).
HarvardSmart Define 2013, undergrounding thesaurus, Smart Define, viewed 21 September, 2026, <https://smartdefine.org/undergrounding/thesaurus/synonyms>.
MLASmart Define. "undergrounding thesaurus" 19 May 2013. Web. 21 September 2026. <https://smartdefine.org/undergrounding/thesaurus/synonyms>