汽車[kisha] train (sometimes specifically a steam train)
汽車賃[kishachin] train fare
汽水[kisui] brackish water
汽船[kisen] steamship
汽笛[kiteki] steam whistle

蒸汽[jouki] steam
夜汽車[yogisha] night train
蒸汽船[joukisen] steamship
汽鑵[kikan] boiler
汽缶室[kikanshitsu] boiler room

薫蒸消毒[kunjoushoudoku] fumigation
蒸かす[fukasu] to steam
蒸ける[fukeru] to become ready to eat (as a result of steaming)
蒸暑い[mushiatsui] humid
蒸し蒸し[mushimushi] hot and humid

蒸し返す[mushikaesu] to reheat
蒸す[musu] to steam
蒸らす[murasu] to cook by steam
蒸れる[mureru] to be stuffy
蒸汽[jouki] steam