36 entries under noun topic. ×
| subway(american, railroad) | |
| tube | |
| metro | |
| resistance | |
| fifth column(expression, secret, subway, subversives) | |
| Maquis | |
| occult(obscure, secret, unknown, hidden) | |
| opposition | |
| subway system | |
| depth | |
| immunity | |
| impedance | |
| railway | |
| resistor | |
| tubing | |
| underpass | |
| black market(expression, idiom, commerce) | |
| pipe | |
| resistivity | |
| antagonism |
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| APA | Smart Define. (2015). underground thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/underground/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "underground thesaurus" https://smartdefine.org/underground/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, underground thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/underground/thesaurus/synonyms>. |
| MLA | Smart Define. "underground thesaurus" 3 November 2015. Web. 25 September 2026. <https://smartdefine.org/underground/thesaurus/synonyms> |