| valley(noun, hollow, bottom, gorge) | |
| bottom(noun, gorge, concavity, vale) | |
| trough(noun, bottom, gorge, valley) | |
| cave(noun, bottom, concavity, cavern) | |
| cavern(noun, bottom, concavity) | |
| channel(bottom, gorge, vale, cavern) | |
| notch(bottom, gorge, vale, cavern) | |
| cleft(bottom, cavern) | |
| cup(bottom, cavern) | |
| den(bottom, cavern) | |
| dish(bottom, cavern) | |
| groove(bottom, cavern) | |
| sinkage(bottom, cavern) | |
| socket(bottom, cavern) |
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| APA | Smart Define. (2016). dale thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/dale/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "dale thesaurus" https://smartdefine.org/dale/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2016, dale thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/dale/thesaurus/synonyms>. |
| MLA | Smart Define. "dale thesaurus" 1 March 2016. Web. 26 September 2026. <https://smartdefine.org/dale/thesaurus/synonyms> |