Iron
Iron noun - A heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood.
Toughness and iron are semantically related. in strength topic. In some cases you can use "Toughness" instead a noun "Iron".
Both words in one sentence
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They make use of advanced body armour to increase their Made of Iron status, and a powerful super steroid to improve their superhuman strength, speed and toughness, at the cost of making it harder to control them.
Source: Film / Universal Soldier -
Some Old West, pulp, and action heroes who are Made of Iron complement physical toughness with stoicism to show mental invulnerability as well.
Source: The Stoic - Made of Iron: Most of your bounties are just normal humans, but their toughness turns some of them into minibosses.
Source: Video Game / New Vegas Bounties
Cite this Source
Toughness and Iron. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/iron/toughness
Iron & Toughness. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/iron/toughness>.
Toughness or Iron. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/iron/toughness.
Google Ngram Viewer shows how "iron" and "toughness" have occurred on timeline