Is it allowed to use the word validator (in the sidebar) during games?

Answer 1

Yes, if you question a word that your opponent has played then you can check it out in the word validator.

Comments

What if you want to check whether a word you want to use is allowed?

Answer 2

It would seem to me that you should be able to.  I wouldn't consider that cheating.  Doesn't make sense that it's only for checking words already played since the game itself acts as a validator.  If it's accepted in the game, it's valid.