Yes, prolix is a Scrabble word!
...and is worth 15 points in Scrabble, and 17 points in Words with Friends
prolix
Adjective
1. Tediously prolonged or tending to speak or write at great length
What Scrabble words can I make with the letters in prolix?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words