Blacksmith

wiktionary

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black(color of iron) +‎  smith(related to  smite)

etymonline

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blacksmith (n.)

late 15c. (mid-13c. as a surname), "smith who works in iron," from black + smith (n.). Listed in royal ordinance (along with bladesmiths, spurriers, and goldbeaters); blacksmiths worked in heated, heavy metals as opposed to those who beat gold, tin, or pewter (the material of a whitesmith).