愛翫[aigan] caring for (esp. a pet or a small object)
翫具[gangu] toy

賞翫[shougan] appreciation
翫ぶ[moteasobu] to play with (a toy, one's hair, etc.)

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

梃摺る[tekozuru] to have much trouble
引摺り[hikizuri] train of dress
引摺り込む[hikizurikomu] to drag in
引摺る[hikizuru] to drag along
摺る[suru] to print

摺り替える[surikaeru] to switch (secretly)
摺り付ける[nasuritsukeru] to rub on
色摺り[irozuri] colour printing
人摺れ[hitozure] sophistication
摺り足[suriashi] sliding feet

褶曲[shuukyoku] bend
褶襞[shuuheki] folds (e.g. on a mountain)

活褶曲[katsushuukyoku] active fold
押しかぶせ褶曲[oshikabuseshuukyoku] overthrust fold