26 entries under hardness topic. ×
| rock(noun, stone, land, hill) | |
| stone(noun, surface, metal, cliff) | |
| granite | |
| crystal(noun, grain, nugget, quartz) | |
| pebble(noun, stone, metal, slab) | |
| adamant | |
| block | |
| board | |
| bone | |
| brick | |
| cartilage | |
| cement | |
| concrete | |
| flint | |
| fossil | |
| marble | |
| quartz | |
| cast iron(expression, idiom) | |
| deal board(expression, idiom) | |
| decarbonized iron(expression, idiom) |
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| APA | Smart Define. (2015). crag thesaurus. Retrieved September 26, 2026, from https://smartdefine.org/crag/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "crag thesaurus" https://smartdefine.org/crag/thesaurus/synonyms (accessed September 26, 2026). |
| Harvard | Smart Define 2015, crag thesaurus, Smart Define, viewed 26 September, 2026, <https://smartdefine.org/crag/thesaurus/synonyms>. |
| MLA | Smart Define. "crag thesaurus" 10 April 2015. Web. 26 September 2026. <https://smartdefine.org/crag/thesaurus/synonyms> |