阿吽の呼吸[aunnokokyuu] the harmonizing, mentally and physically, of two parties engaged in an activity
歓呼[kanko] acclamation
関数呼出し[kansuuyobidashi] function call
呼び回る[yobimawaru] to call out (for someone)
呼び覚ます[yobisamasu] to wake up

呼掛ける[yobikakeru] to call out to
呼寄せる[yobiyoseru] to call
呼起す[yobiokosu] to wake someone (by calling for them)
呼び迎える[yobimukaeru] to send for
呼び込む[yobikomu] to call in

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