TWL (Tournament Word List, also known as OWL - Official Club and Tournament Word List) is a word list created under the auspices of Hasbro, the owner of Scrabble. The original list was available in 1995. TWL2 is an updated version of the original, published in 2006. Being so new, it probably has more new and current words in it than any other word game list. It was provided to us by Robert Gillis, who worked on its preparation.
More information about TWL2/OWL