悪習慣[akushuukan] bad habit
慣らす[narasu] to accustom
慣れ[nare] practice
慣れる[nareru] to grow accustomed (to)
慣行[kankou] customary practice

慣行取引き[kankoutorihiki] usual business practices (practises)
慣習[kanshuu] usual (historical) custom
慣性[kansei] inertia
慣用[kanyou] common
慣用句[kanyouku] idiomatic usage

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