22 entries under hardness topic. ×
| rock(noun, stone, metal, slab) | |
| stone(noun, surface, metal, slab) | |
| flint | |
| cement | |
| concrete | |
| crag(noun, stone, metal, slab) | |
| crystal(noun, nugget, quartz) | |
| granite | |
| adamant | |
| block | |
| board | |
| fossil | |
| hardware | |
| iron | |
| marble | |
| nail | |
| quartz | |
| steel | |
| wrought iron(expression, idiom) | |
| bone |
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| APA | Smart Define. (2016). pebble thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/pebble/thesaurus/synonyms |
| Chicago | Smart Define. 2016. "pebble thesaurus" https://smartdefine.org/pebble/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2016, pebble thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/pebble/thesaurus/synonyms>. |
| MLA | Smart Define. "pebble thesaurus" 23 February 2016. Web. 25 September 2026. <https://smartdefine.org/pebble/thesaurus/synonyms> |