遺作[isaku] posthumous works
一毛作[ichimousaku] (a) single crop
稲作[inasaku] rice cultivation
永小作[eikosaku] perpetual land lease
永子作権[eikosakuken] perpetual land lease

英作文[eisakubun] English composition
遠隔操作[enkakusousa] remote control
佳作[kasaku] good piece of work
家作[kasaku] making house
寡作[kasaku] low production

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