Dictionary used in Scrabble

Official Tournament and Club Word List

Used for Scrabble Word Finder (Last check 28-02-2019)
Short name: OTCWL, OWL, or TWL
Current edition is OTCWL2018
The official word authority for tournament Scrabble in the USA, Canada and Thailand. OWL3 contains every word in OSPD6 plus has additional words.
Number of words in our dictionary: 192111
link: https://en.wikipedia.org/wiki/Official_Tournament_and_Club_Word_List

Official checker: http://www.scrabbleplayers.org/w/Official_Tournament_and_Club_Word_List

Collins Scrabble Words

Used for Scrabble Word Finder (Last check 04-03-2019)
Short name: SOWPODS, CSW
Current edition is CSW15 (2015)
The word list used in English-language tournament Scrabble in most countries except the USA, Thailand and Canada. It is used in the World Scrabble Championships in the British and in the Australia, New Zealand, Malta and Emirates tournaments.
Number of words in our dictionary: 276663
link: https://en.wikipedia.org/wiki/Collins_Scrabble_Words
Official checker: https://www.collinsdictionary.com/scrabble/scrabble-word-finder

Official Scrabble Players Dictionary

Used for Scrabble Word Finder (Last check 28-02-2019)
OSPD6 : Official SCRABBLE Players Dictionary Sixth Edition (published 24 September 2018)
OSPD5 : Official SCRABBLE Players Dictionary Fifth Edition (published 06 August 2014)
OSPD4 : Official SCRABBLE Players Dictionary Fourth Edition (published late 2005)
List is the official word source of tournament Scrabble in the United States, Canada, Thailand and Israel. It ideal for school and family use. OSPD does not include base words longer than 8 letters. This is part of OTCWL2014.
Number of words in our dictionary: 175131
link: https://en.wikipedia.org/wiki/Official_Scrabble_Players_Dictionary
Official checker: https://scrabble.hasbro.com/en-us/tools (By Merriam-Webster)

School SCRABBLE Word List

Short name: SSWL
Current edition is SSWL2016 (23-08-2016)
SSWL is not currently available in printed form. SSWL2016 is available to NASPA members for electronic study and tournament adjudication purposes in the NASPA Zyzzyva program.

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