| sodium(noun, element) | |
| stiff-necked(adjective, mean, hard, tough, firm) | |
| stocks | |
| stone(adjective, dull, lead, grim, hardness) | |
| strict(adjective, hard, persistent, rigid, obstinate) | |
| strong-willed(adjective, determined, resolution, resolute, uncompromising) | |
| strontium(noun, element) | |
| tantalum(noun, element) | |
| technetium(noun, element) | |
| terbium(noun, element) | |
| thallium(noun, element) | |
| thulium(noun, element) | |
| titanium(noun, element) | |
| tough(adjective, mean, strong, hard, firm) | |
| tungsten(noun, element) | |
| uncooperative(adjective, mean, hard, persistent, rigid) | |
| unfeeling | |
| unflinching(adjective, resolution, persistent, obstinate, insistent) | |
| uranium(noun, element) | |
| vanadium(noun, element) |
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| APA | Smart Define. (2015). iron thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/iron/thesaurus/synonyms |
| Chicago | Smart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 25, 2026). |
| Harvard | Smart Define 2015, iron thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>. |
| MLA | Smart Define. "iron thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms> |