The crossword solution for the term 'ending for 'who' or 'WHERE'' is 'EVER, ' which is a four-letter word. EVER is an adverb that is used to describe something that happens at all times, or something that happens without interruption. It is often used in questions such as 'Who EVER said that?' or 'WHERE EVER did you find that?' In these examples, the word 'EVER' is used to emphasize the question and to ask if something has EVER happened before.