The term 'MASK FEATURE' can be broken down into four crossword solutions: EYEHOLE (7 letters), SLIT (4 letters), EYEHOLES (8 letters), and GOALIE (6 letters). EYEHOLE and EYEHOLES refer to the holes cut into a mask, usually for the eyes. SLIT is a narrow opening or cut, which could refer to the mouth opening of a mask. Finally, GOALIE is a term used in hockey to refer to the player who wears a mask to protect their face. All of these terms are related to the features of a mask.