3
gold(noun, element)
3
heavy(adjective, strong, hard, tough, inflexible)
3
holmium(noun, element)
3
indium(noun, element)
3
indurate(adjective, set, mean, hard, firm)
3
intractable(adjective, tough, firm, unreasonable, grim)
3
iridium(noun, element)
3
lanthanum(noun, element)
3
leaden(adjective, dull, lead, grim, mousy)
3
lithium(noun, element)
3
lutetium(noun, element)
3
magnesium(noun, element)
3
manganese(noun, element)
3
mercury(noun, element)
3
molybdenum(noun, element)
3
neodymium(noun, element)
3
nickel(noun, element)
3
niobium(noun, element)
3
oak
3
osmium(noun, element)
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APASmart Define. (2015). iron thesaurus. Retrieved September 24, 2026, from https://smartdefine.org/iron/thesaurus/synonyms
ChicagoSmart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 24, 2026).
HarvardSmart Define 2015, iron thesaurus, Smart Define, viewed 24 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>.
MLASmart Define. "iron thesaurus" 14 April 2015. Web. 24 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms>