| gold(noun, element) | |
| heavy(adjective, strong, hard, tough, inflexible) | |
| holmium(noun, element) | |
| indium(noun, element) | |
| indurate(adjective, set, mean, hard, firm) | |
| intractable(adjective, tough, firm, unreasonable, grim) | |
| iridium(noun, element) | |
| lanthanum(noun, element) | |
| leaden(adjective, dull, lead, grim, mousy) | |
| lithium(noun, element) | |
| lutetium(noun, element) | |
| magnesium(noun, element) | |
| manganese(noun, element) | |
| mercury(noun, element) | |
| molybdenum(noun, element) | |
| neodymium(noun, element) | |
| nickel(noun, element) | |
| niobium(noun, element) | |
| oak | |
| osmium(noun, element) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 24, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |