火焔放射器[kaenhoushaki] flamethrower
気焔万丈[kienbanjou] in high spirits
光焔[kouen] light and flame
紅焔[kouen] red flame
火焔[kaen] flame

情焔[jouen] burning passion
気焔[kien] high spirits
焔硝[enshou] gunpowder
残焔[zanen] lingering heat (in autumn)

硝子[garasu] glass
フリント硝子[furintogarasu] flint glass
亜硝酸[ashousan] nitrous acid
亜硝酸塩[ashousanen] nitrite
硝煙[shouen] gunpowder smoke

硝酸[shousan] nitric acid
硝酸塩[shousanen] nitrate
硝酸銀[shousangin] silver nitrate
硝石[shouseki] saltpeter
天然硝子[tennengarasu] natural glass