The crossword solution for the term SUFFIX FOR PUZZLE is MENT, which is a four-letter word. The suffix 'ment' is commonly used to form nouns from verbs, and is often used to refer to an action or process. In this case, it is used to refer to the process of solving puzzles. Thus, the term SUFFIX FOR PUZZLE can be interpreted as 'ment, ' which is a suffix used to refer to the process of solving puzzles.