Words With Friends is a popular “Scrabble” style word game on the iOS. To judge if a word is playable or not it uses a modified version of the Enable1 word list. The WWF list has some deletions and some additions:
This is the command I used to find the lists of changed words between the versions. It only works for word lists that are reasonably close, so would probably not work for comparing SOWPODS to TWL/OWL.
diff enable1lf.txt enable1-wwf3.12.txt | sort | grep "^>.*" | cut -c 3- | tr '\n' ',' | sed s/.$// | pbcopy
Delete words are mostly profanity and racial slurs, close your eyes now if you don’t want to see.