The term ACTION SUFFIX refers to a group of suffixes that are added to the end of words to indicate an action or process. The crossword solutions for this term are ENCE (4 letters), ING (3 letters), IZE (3 letters), ION (3 letters), TION (4 letters), and MENT (4 letters). ENCE is a suffix that indicates a result or consequence of an action, ING is a suffix that indicates an ongoing action, IZE is a suffix that indicates a transformation or change, ION is a suffix that indicates a state of being, TION is a suffix that indicates a process or action, and MENT is a suffix that indicates a state of mind or feeling.