| rufous(adjective, colour) | |
| russet(adjective, colour) | |
| rust(adjective, colour) | |
| saprolite | |
| sarsen | |
| scarlet(adjective, colour) | |
| schist | |
| scree | |
| sedimentary rock | |
| shale(noun, rock) | |
| shelf | |
| shelly pahoehoe | |
| sinopia(adjective, colour) | |
| smoke | |
| smudge | |
| smut | |
| sullage | |
| talus | |
| terra cotta(adjective, colour) | |
| tufa |
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| APA | Smart Define. (2015). lava thesaurus. Retrieved September 23, 2026, from https://smartdefine.org/lava/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "lava thesaurus" https://smartdefine.org/lava/thesaurus/synonyms (accessed September 23, 2026). |
| Harvard | Smart Define 2015, lava thesaurus, Smart Define, viewed 23 September, 2026, <https://smartdefine.org/lava/thesaurus/synonyms>. |
| MLA | Smart Define. "lava thesaurus" 10 April 2015. Web. 23 September 2026. <https://smartdefine.org/lava/thesaurus/synonyms> |