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

基数の補数[kisuunohosuu] radix complement
兼補[kenpo] carrying on a second line of work
候補[kouho] candidate
候補者[kouhosha] candidate
候補生[kouhosei] cadet

候補地[kouhochi] proposed site
公認候補[kouninkouho] official candidate
公認候補者[kouninkouhosha] official candidate
主格補語[shukakuhogo] subject complement
修補[shuuho] repairing