The crossword solution for the term 'ENDING FOR MOD OR NOD' is ULE, which is a three-letter word. ULE is an abbreviation for the word 'MODULE, ' which is a self-contained component of a larger system. It can also be used as an abbreviation for 'NODULE, ' which is a small, solid mass of tissue that forms in various parts of the body. In both cases, ULE is used to refer to a small, distinct part of a larger whole.