[Alneyan]

If you did want to cheat, who is to prevent you from using a program finding words for you? The computer Version of Scrabble comes with such helps, so you could probably use it in the Online Version (if you have nothing better to do).

Of course, it mostly applies to playing with random people on the net; I guess that we can trust one another on this forum for example.

Slightly less on topic, add ancient Greek to your list Randallw and I think you have all the roots of English words. While they aren't too many actual Greek words that I can think of ("phenomenon" and its plural form "phenomena" would be one, like "psyche" and a few other not so common words), Greek words are commonly used to make compound nouns (such as, say, "biology", the study of life). But it isn't so particular to English alone, and I am digressing even more.