The term 'NOT MASC. OR FEM.' can be summarized by the crossword solution 'NEUT, ' which is a four-letter word meaning neither masculine nor feminine. This term is often used to describe gender identities that are not exclusively male or female, such as non-binary, genderqueer, and agender. It is also used to refer to things that are not associated with either gender, such as language, clothing, and behavior.