Yes, duello is a Scrabble word!
...and is worth 7 points in Scrabble, and 10 points in Words with Friends
Duello is a valid Scrabble word.
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What Scrabble words can I make with the letters in duello?
Words that can be created with an extra letter added to duello:
There are 4 words that can be made by adding another letter to 'duello'.