Yes, mahjong is a Scrabble word!
...and is worth 20 points in Scrabble, and 24 points in Words with Friends
mahjong
Noun
1. Chinese game played by 4 people with 144 tiles
What Scrabble words can I make with the letters in mahjong?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words