4
severe(adjective, persistent, obstinate, insistent, dogged)
4
silver(noun, dull, element, gold, leaden)
4
smooth clothing
4
steam(verb, activity, move, hold, calm)
4
stiff(adjective, firm, resolute, rigid, inflexible)
4
stout
4
trammel(noun, verb, restraint, shackle, cable)
4
vigorous(adjective, strong)
4
yttrium(noun, element)
4
zinc(noun, element)
4
zirconium(noun, element)
3
brick
3
aluminum(noun, element)
3
americium(noun, element)
3
barium(noun, element)
3
beryllium(noun, element)
3
bismuth(noun, element)
3
block(noun, hardness)
3
bronze
3
cadmium(noun, element)
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APASmart Define. (2015). iron thesaurus. Retrieved September 25, 2026, from https://smartdefine.org/iron/thesaurus/synonyms
ChicagoSmart Define. 2015. "iron thesaurus" https://smartdefine.org/iron/thesaurus/synonyms (accessed September 25, 2026).
HarvardSmart Define 2015, iron thesaurus, Smart Define, viewed 25 September, 2026, <https://smartdefine.org/iron/thesaurus/synonyms>.
MLASmart Define. "iron thesaurus" 14 April 2015. Web. 25 September 2026. <https://smartdefine.org/iron/thesaurus/synonyms>