The term ALE SOURCE is composed of five words, each with a different number of letters. The first word is PUB, which is an abbreviation for public house, a type of establishment that serves alcoholic beverages. The second word is BREWERY, which is a place where beer is produced. The third word is PALE, which is a type of ale that is light in color and has a mild flavor. The fourth word is BREW, which is the process of making beer. The fifth word is PINT, which is a unit of measurement for beer. Together, these words describe the source of ale, which is a type of beer.