Yes, dues is a Scrabble word!
...and is worth 5 points in Scrabble, and 6 points in Words with Friends
dues
Noun
1. That which is deserved or owed
2. A payment that is due (e.g., as the price of membership)
What Scrabble words can I make with the letters in dues?
4 Letter Words
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3 Letter Words
2 Letter Words