‘볼’은 뺨의 가운데를 이루고 있는 살 (the center of the cheeks) '뺨'은 얼굴의 양쪽 관자놀이에서 턱 위까지의 살 (the fleshly parts from the temples on both sides of the face to the chin) ------------------------------------------------------- Definitions for these 2 words are slightly different, but they are interchangeable in usage such as the following: 추워서 볼(=뺨)이 빨개요. (My cheeks are red because I am cold.) 아이가 귀여워서 볼(=뺨)을 쓰다듬었어요. (The baby was cute, so I stroked her/his cheeks.)