NASPA Word List (NWL, formerly Official Tournament and Club Word List, referred to as OTCWL, OWL, TWL) is the official word authority for tournament Scrabble in the USA and Canada under the aegis of NASPA Games.[1] It is based on the Official Scrabble Players Dictionary (OSPD) with modifications to make it more suitable for tournament play. Its British and international-English counterpart is Collins Scrabble Words.