The term 'GRADE Enhancer' can be broken down into two words, 'GRADE' and 'Enhancer'. GRADE is a noun that refers to a level of quality or achievement, while Enhancer is a verb that means to make something better or more effective. The crossword solution for the term 'GRADE Enhancer' is 'PLUS', which is a four-letter word that can be used as an adjective to describe something that is of a higher quality or greater value than what is expected. In this context, 'PLUS' is used to refer to something that can help improve a GRADE or make it higher than it would have been without the help.