To the people who insist that they know every word in the English language, and are thus the leading authority on the subject, I urge you to rethink your status. There is a very strict guideline for a word to be a legal play in Scrabble, and each word on that board follows that guideline, and as such, is legal. There are many words in the TWL (the tournament word list, which is the official list of words valid in the game) which are not used as part of our daily language. This is due to the tendency for words to gain entry into our language much faster than they depart. Consequently, we have many words left over from yesteryear, which will eventually leave the leading English dictionaries, and, consequently, the TWL.