Currently the two main sources for the words making up the combined list (generally known as Collins) are: In 1980 in the United Kingdom, the Chambers Dictionary replaced the Shorter Oxford Dictionary as the official choice for arbitration of the British National Scrabble Championship.
In 1988 for the first time a single list of all the valid words, without the ambiguity of discussing conjugations, declensions and plurals was published under the title Official Scrabble Words from Chambers (this would come to be known as OSW).
Over the following years there was disagreement in the competitive Scrabble community over the desirability of a combined word source, which came to be known as SOWPODS as an easily pronounced anagram of OSW and OSPD.
In December 2003,[3] Collins took over the publication of the official word list sanctioned by WESPA, and the current edition is CSW22.
This is following a directive from Mattel,[5] who committed to ongoing review and removal of words and definitions, removing hate speech from the game and obliging Collins publisher as a licensee to implement these changes.