佚書[issho] lost book
佚する[issuru] to lose (a chance)
佚楽[itsuraku] pleasure
安佚[anitsu] (idle) ease

放佚[houitsu] self-indulgence
散佚[sanitsu] being scattered and ultimately lost
淫佚[initsu] debauchery

哀楽[airaku] grief and pleasure
愛楽[aigyou] seeking after (Buddhist teachings, etc.)
安楽[anraku] ease
安楽死[anrakushi] euthanasia
悦楽[etsuraku] enjoyment

音楽[ongaku] music
音楽の素質[ongakunososhitsu] aptitude for music
音楽会[ongakukai] concert
音楽史[ongakushi] music history
音楽大学[ongakudaigaku] College of Music