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The Official SCRABBLE Players Dictionary (OSPD) is a popular reference book listing words of 2 to 8 letters and their possibly longer inflections. It is published and edited by Merriam-Webster based on research conducted by the NASPA Dictionary Committee. It is widely used in charity events, but not suitable for serious competition, which instead use NASPA's larger Official Tournament and Club Word List (OTCWL) instead.
OSPD and OTCWL differ as follows:
The fifth edition of OSPD went on sale on August 6, 2014. It was edited in tandem with OTCWL2014, and contains those words from that larger lexicon which are considered appropriate for school and recreational play, up to 8 letters in length.
The fourth edition of OSPD went on sale in 2005. It was edited in tandem with OTCWL2.
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