永劫[eigou] eternity
億劫[okkuu] troublesome
劫火[gouka] world-destroying conflagration
劫盗[goutou] highway robber
劫罰[goubatsu] eternal punishment

劫かす[obiyakasu] to intimidate
劫略[gouryaku] pillage
万劫[bangou] eternity
未来永劫[miraieigou] eternity

火燵掛布[kotatsugake] cover for kotatsu
火燵布団[kotatsubuton] cover for kotatsu
引火[inka] catching fire
引火温度[inkaondo] flash temperature
引火点[inkaten] flash point

曳火弾[eikadan] tracer bullet
煙火[enka] smoke and fumes (e.g. from cooking)
遠火[toobi] distant fire
下火[shitabi] burning low
下火になる[shitabininaru] to be under control