悪習[akushuu] bad habit
悪習慣[akushuukan] bad habit
演習[enshuu] practice
演習問題[enshuumondai] practice problem
演奏練習[ensourenshuu] musical rehearsal

学習[gakushuu] study
学習者[gakushuusha] learner
学習塾[gakushuujuku] private night-school
学習用[gakushuuyou] tutorial
学習用ヘルプ[gakushuuyouherupu] tutorial help

遺愛[iai] bequest
遺影[iei] portrait of deceased person
遺詠[iei] posthumous song or poem
遺家族[ikazoku] bereaved family
遺誡[ikai] one's last caution

遺骸[igai] remains
遺憾[ikan] regrettable
遺業[igyou] work left at death
遺訓[ikun] dying instructions
遺賢[iken] able men left out of office