26 entries under hardness topic. ×
| hardware | |
| heart of oak(expression, idiom) | |
| iron | |
| nail | |
| steel | |
| wrought iron(expression, idiom) |
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| APA | Smart Define. (2015). fossil thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/fossil/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "fossil thesaurus" https://smartdefine.org/fossil/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, fossil thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/fossil/thesaurus/synonyms>. |
| MLA | Smart Define. "fossil thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/fossil/thesaurus/synonyms> |