60 entries under opening topic. ×
| hole(noun, verb, nature, beam) | |
| mine(noun, verb, hurt, ruin, destroy) | |
| den(noun, nature, break, cut, crack) | |
| shaft(noun, break, cut, line, crack) | |
| adit(noun, conduit, access, passageway) | |
| bore(verb, turn, produce, clean, discover) | |
| channel(noun, verb, turn, produce, clean) | |
| passage(noun, conduit, passageway) | |
| tube(noun, conduit, passageway, hose) | |
| gallery | |
| pit(noun, verb, break, turn, produce) | |
| lair(noun, break, cut, crack) | |
| scoop out(verb, expression, phrasal verb, turn, produce) | |
| drill(verb, turn, produce, clean, discover) | |
| funnel(noun, conduit) | |
| gully(noun, conduit) | |
| main | |
| passageway(noun, channel) | |
| pipe(method, conduit) | |
| canal |
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| APA | Smart Define. (2015). tunnel thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/tunnel/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "tunnel thesaurus" https://smartdefine.org/tunnel/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, tunnel thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/tunnel/thesaurus/synonyms>. |
| MLA | Smart Define. "tunnel thesaurus" 10 April 2015. Web. 25 September 2026. <https://smartdefine.org/tunnel/thesaurus/synonyms> |