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

悔改める[kuiaratameru] to repent
改まる[aratamaru] to be renewed
改めて[aratamete] another time
改める[aratameru] to change
改悪[kaiaku] deterioration

改印[kaiin] changing seals
改革[kaikaku] reform
改革案[kaikakuan] reform proposal
改革過程[kaikakukatei] reform process
改憲[kaiken] constitutional change