30 entries under opening topic. ×
| passage(noun, bank, room, entrance) | |
| passageway(noun, bank, room, entrance) | |
| tunnel | |
| adit | |
| channel | |
| mine | |
| pit | |
| canal | |
| chimney | |
| fistula | |
| flue | |
| funnel | |
| water pipe(expression, idiom) | |
| adjutage | |
| air pipe(expression, idiom) | |
| ajutage | |
| gully | |
| gut | |
| main | |
| ostium |
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| APA | Smart Define. (2015). gallery thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/gallery/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "gallery thesaurus" https://smartdefine.org/gallery/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, gallery thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/gallery/thesaurus/synonyms>. |
| MLA | Smart Define. "gallery thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/gallery/thesaurus/synonyms> |