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

擦れ擦れ[suresure] grazing
パイ擦り[paizuri] breast fucking
靴擦れ[kutsuzure] shoe sore
擦り替える[surikaeru] to switch (secretly)
擦りむく[surimuku] to skin (one's knee)

擦剥ける[surimukeru] to abrade
擦抜ける[surinukeru] to slip through
擦付ける[nasuritsukeru] to rub on
擦る[kosuru] to rub
擦れっ枯し[surekkarashi] shameless person