How do you say iron in Japanese?
— アイロンをかける (airón wo kakéru); 鉄

Generic synonyms for iron in Japanese
metal金属 (きんぞく, kinzoku) (1), 金属製のもの (kinzokusei no mono) (2)
Substance meronyms for iron in Japanese
steel鋼鉄 (こうてつ, kōtetsu)