27 entries under expression topic. ×
| railway system | |
| thermionic tube | |
| thermionic vacuum tube | |
| thermionic valve | |
| train track(noun, line, track) | |
| underground train | |
| vacuum tube |
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| APA | Smart Define. (2015). metro thesaurus. Retrieved September 22, 2026, from https://smartdefine.org/metro/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "metro thesaurus" https://smartdefine.org/metro/thesaurus/synonyms (accessed September 22, 2026). |
| Harvard | Smart Define 2015, metro thesaurus, Smart Define, viewed 22 September, 2026, <https://smartdefine.org/metro/thesaurus/synonyms>. |
| MLA | Smart Define. "metro thesaurus" 10 April 2015. Web. 22 September 2026. <https://smartdefine.org/metro/thesaurus/synonyms> |