| severe(adjective, persistent, obstinate, insistent, dogged) | |
| silver(noun, dull, element, gold, leaden) | |
| smooth clothing | |
| steam(verb, activity, move, hold, calm) | |
| stiff(adjective, firm, resolute, rigid, inflexible) | |
| stout | |
| trammel(noun, verb, restraint, shackle, cable) | |
| vigorous(adjective, strong) | |
| yttrium(noun, element) | |
| zinc(noun, element) | |
| zirconium(noun, element) | |
| brick | |
| aluminum(noun, element) | |
| americium(noun, element) | |
| barium(noun, element) | |
| beryllium(noun, element) | |
| bismuth(noun, element) | |
| block(noun, hardness) | |
| bronze | |
| cadmium(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> |