What is another word for "iron"?

Roget's Thesaurus (1911) lists these synonyms for "iron": adamant, adamantean, adamantine, back, bird, block, board, bond, bone, bony, brick, buckram, calculous, callosity, captive, cartilage, cartilaginous, cast, cement, clench, clinch, close, clutch, concrete, corneous, crag, crystal, crystallization, custody, deal, detain, detention, durity, entail, fast, finger, firm, fist, flint, forceps.