The Official Word List (OWL) version 3.1
OWL 3.1 (also known as TWL15) is the current official dictionary for Scrabble players in the USA, Canada and Thailand … and the Jerusalem Scrabble Club. OWL is based on the OSPD (Official Scrabble Players Dictionary) which is considered appropriate for “school and recreational play”. OWL, however, includes offensive and vulgar words omitted in OSPD.
There are 188,738 playable words in OWL 3.1, distributed by word length as follows: