The term SOWPODS was coined to cover the convergence of the two International Scrabble© word sources, OSW and OSPD, as deployed for the 1991 World Scrabble© Championships in London and subsequent World Championships. SOWPODS is an acronym derived from anagramming OSW and OSPD. 

Official Tournament and Club Word List (OWL)
OWL is an expanded version of the Official Scrabble Players Dictionary (OSPD) [3rd edition]. The additional words included in OWL (but not OSPD) are mostly those which were expurgated (censored) from OSPD for the popular market, i.e. words (arbitrarily) considered offensive. OWL also goes up to 9 letters (plus extensions), whereas OSPD only goes up to 8 letters (plus extensions). OWL is "published" by the National Scrabble Association (NSA) in the United States. It is distributed to NSA members only. OWL is primarily used in North American and Israel. OWL is also known as TWL98, which means Tournament Word List.

OWL2/LWL contains the words from the Official Word List 2nd edition, plus the Long Word List. The OWL2 contains words up to nine letters long plus their inflections, while the LWL contains words 10-15 letters long.

OSW itself stands for Official Scrabble© Words, a publication derived solely from the Chambers Dictionary, published in Scotland. OSW is exclusively used in the United Kingdom only.

CSW07 List, Collins Tournament and Club Word List. This is the authority for all tournament and club play. All tournaments which are either run and/or rated by the ABSP use this reference work as the arbiter for determining the validity of every word played. It contains every word added to TWL last year, and more new words obtained from Collins English Dictionary.

CSW or Collins Scrabble Words is the global world source used in Scrabble. CSW2012 is the newest edition, in previous years the global word list was also known as SOWPODS. CSW is not a single dictionary but an amalgam of three: Collins (7th edition, 2005), Chambers (1998 edition) and TWL, the current Northern American wordlist. TWL itself is also drawn from a range of sources.

From January 2012 we will only be using CSW2012, (
Collins Tournament and Club Word List 2012).

 OSPD stands for Official Scrabble© Players Dictionary, a publication derived primarily from the Merriam-Webster's Dictionary, but also including words from four other major college dictionaries. It is published by Merriam-Webster, in the United States. OSPD is exclusively used in North America, Thailand, and Israel. 

OSPD4 is a major update of OSPD3, and contains many words found in SOWPODS and OWL/TWL98.

The following countries are known to be fully SOWPODS:- Australia, Bahrain, Ghana, Hong Kong, India, Japan, Kenya, Kuwait, Malaysia, Malta, New Zealand, Nigeria, Oman, Pakistan, Philippines, Qatar, Saudi Arabia, Singapore, South Africa, Trinidad, United Arab Emirates, United Kingdom. Source

OWL1, OWL2 and CSW List have been added to cater for the Tournament Players who play here. The all dictionaries search results page provides all lookups to accommodate all players. OSPD4 is used primarily in Canada, US, Thailand, and Israel. SOWPODS is used internationally.

Note, we used freely available files off the Net as the dictionaries here. If there are any errors you know of, please consult the actual book. It would be nice if you tell us, so we can update our database. 

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