鬼利死丹[kirishitan] early Japanese Christianity (from the later Muromachi period)
あっ死[asshi] crushing to death
安楽死[anrakushi] euthanasia
一死[isshi] dying
一死後[isshigo] after one out (in Baseball)

一死報国[isshihoukoku] dying for one's country
煙死[enshi] death by smoke suffocation
横死[oushi] violent (tragic or accidental) death
仮死[kashi] asphyxiation
過労死[karoushi] death from overwork and mental stress

栄枯盛衰[eikoseisui] ups and downs of life
減衰[gensui] attenuation
減衰器[gensuiki] attenuator
古び衰える[furubiotoroeru] to waste away
弱り衰える[yowariotoroeru] to languish

神経衰弱[shinkeisuijaku] neurasthenia
衰える[otoroeru] to become weak
衰え果てる[otoroehateru] to be utterly spent or crushed
衰運[suiun] declining fortunes
衰躯[suiku] emaciated body