金無垢[kinmuku] pure gold
歯垢[shikou] (dental) plaque
耳垢[mimiaka] earwax
手垢[teaka] finger marks
無垢[muku] purity

頭垢[fuke] dandruff
垢抜ける[akanukeru] to refine
純真無垢[junshinmuku] pure
寒垢離[kangori] cold-water ablutions performed in winter

土耳古[toruko] Turkey
白耳義[berugii] Belgium
外耳[gaiji] external ear
牛耳る[gyuujiru] to control
口耳[kouji] mouth and ear

口耳の学[koujinogaku] shallow learning
耳がとおい[mimigatooi] poor hearing
耳をすます[mimiwosumasu] to listen carefully
耳を貸す[mimiwokasu] to lend an ear to