| palladium(noun, element) | |
| persistent(adjective, obstinate, insistent, dogged) | |
| phosphorus(noun, element) | |
| pillory | |
| plane(verb, calm, quiet, clear, press) | |
| polonium(noun, element) | |
| praseodymium(noun, element) | |
| promethium(noun, element) | |
| protactinium(noun, element) | |
| radium(noun, element) | |
| refractory(adjective, persistent, obstinate, insistent, dogged) | |
| rhenium(noun, element) | |
| rock | |
| rock-ribbed(adjective, determined, resolute, uncompromising, unshakeable) | |
| rubidium(noun, element) | |
| ruthenium(noun, element) | |
| samarium(noun, element) | |
| scandium(noun, element) | |
| single-minded(adjective, tough, firm, unreasonable, grim) | |
| smoothing iron(noun, expression, idiom) |
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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> |