SOWPODS is an anagram of the abbreviations OSPD (Official Scrabble Players Dictionary) and OSW (Official Scrabble Words), which were the first two official dictionaries used at the time in different parts of the world. In Britain, they call these words 'Official Scrabble Words.' In the United States, they call them 'Scrabble Players' Dictionary' (OSPD). TWL is a mash-up of British and American words from the Collings English Dictionary and the Official Tournament and Club Word List (TWL06).