冶具[jigu] jig (tool)
鍛冶[kaji] smithing
刀鍛冶[katanakaji] swordsmith
冶金[yakin] metallurgy
冶金学[yakingaku] metallurgy (the science)

冶金学者[yakingakusha] metallurgist
冶工[yakou] metallurgical worker
陶冶[touya] training
鍛冶屋[kajiya] smith

一刀[ittou] sword
一刀彫り[ittoubori] one-knife carving
一刀両断[ittouryoudan] cutting in two with a single stroke
印刀[intou] seal-engraving knife
円刃刀[enjintou] round-edged scalpel

快刀[kaitou] (literary) sharp sword
快刀乱麻[kaitouranma] solving a problem swiftly and skillfully
懐刀[futokorogatana] confidant
儀刀[gitou] ceremonial sword
軍刀[guntou] saber

可鍛性[katansei] malleability
可鍛鉄[katantetsu] malleable iron
鍛える[kitaeru] to forge
鍛え上げる[kitaeageru] to temper thoroughly
鍛工[tankou] metal worker

鍛治[tanya] smithing
鍛練[tanren] tempering
刀鍛冶[katanakaji] swordsmith
鍛造[tanzou] forging
鍛接[tansetsu] forge welding