26 entries under hardness topic. ×
| quartz(noun, mineral) | |
| stone(noun, figure, surface, nugget) | |
| crag(grain, nugget, quartz, pebble) | |
| board | |
| brick | |
| flint | |
| pebble(nugget, quartz) | |
| rock(noun, nugget, quartz, pebble) | |
| adamant | |
| cartilage | |
| cement | |
| concrete | |
| fossil | |
| granite | |
| marble | |
| block | |
| bone | |
| cast iron(expression, idiom) | |
| deal board(expression, idiom) | |
| decarbonized iron(expression, idiom) |
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| APA | Smart Define. (2016). crystal thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/crystal/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "crystal thesaurus" https://smartdefine.org/crystal/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, crystal thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/crystal/thesaurus/synonyms>. |
| MLA | Smart Define. "crystal thesaurus" 22 February 2016. Web. 25 September 2026. <https://smartdefine.org/crystal/thesaurus/synonyms> |