黄鉄鉱[outekkou] iron pyrites
可鍛鉄[katantetsu] malleable iron
狭軌鉄道[kyoukitetsudou] narrow-gauge railway
近鉄[kintetsu] Kinki Nippon Tetsudou (railway co.)
剣付き鉄砲[kentsukideppou] fixed bayonet

甲鉄[koutetsu] armor
甲鉄艦[koutetsukan] armored ship
甲鉄板[koutetsuban] armor plate
鋼鉄[koutetsu] steel
国鉄[kokutetsu] national railway (esp. Japan National Railways)

基地閉鎖[kichiheisa] (military) base closing
金鎖[kingusari] golden chain
鎖国[sakoku] national isolation
鎖骨[sakotsu] collarbone
鎖樋[kusaritoi] rain chain (hanging from a gutter and functioning as downspout, often made of ornamental cups)

再封鎖[saifuusa] reblocking
道路封鎖[dourofuusa] roadblock
封鎖[fuusa] blockade
鎖す[sasu] to shut