往復[oufuku] making a round trip
恢復[kaifuku] restoration
回復可能[kaifukukanou] recoverable
回復不可能[kaifukufukanou] non-recoverable
回復力[kaifukuryoku] resilience

経済回復[keizaikaifuku] economic recovery
経済復興[keizaifukkou] economic revitalization
克復[kokufuku] restoration
主権回復[shukenkaifuku] restoration of sovereignty
修復[shuufuku] restoration

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