It is very frustrating because they allow "words" that are not really words. They will say it is a valid word in this game but they don't have a definition for it yet. This happens fairly frequently. And quite a few are not recognized by other word games so if they don't have a definition for it I think it should not be a word. They allow many abbreviations. But then not some other common abbreviations. Many words allowed are from other languages and we are playing the English version .