30 entries under opening topic. ×
| adit | |
| air pipe(expression, idiom, airpipe) | |
| ajutage | |
| fistula | |
| gallery | |
| gut | |
| mine | |
| pit | |
| way | |
| ostium |
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| APA | Smart Define. (2015). tube thesaurus. Retrieved September 29, 2026, from https://smartdefine.org/tube/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "tube thesaurus" https://smartdefine.org/tube/thesaurus/synonyms (accessed September 29, 2026). |
| Harvard | Smart Define 2015, tube thesaurus, Smart Define, viewed 29 September, 2026, <https://smartdefine.org/tube/thesaurus/synonyms>. |
| MLA | Smart Define. "tube thesaurus" 5 June 2015. Web. 29 September 2026. <https://smartdefine.org/tube/thesaurus/synonyms> |