哀悼[aitou] condolence
戦没者追悼記念日[senbotsushatsuitoukinenbi] Memorial Day (US)
追悼[tsuitou] mourning (dead persons)
追悼会[tsuitoukai] memorial services
追悼式[tsuitoushiki] memorial services

悼む[itamu] to grieve over
悼辞[touji] funeral address
死を悼む[shiwoitamu] to mourn over the death of
戦没者追悼式[senbotsushatsuitoushiki] memorial service for the war dead
哀悼痛惜[aitoutsuuseki] condolence

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