Yes, decile is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
decile
Noun
1. (statistics) any of nine points that divided a distribution of ranked scores into equal intervals where each interval contains one-tenth of the scores
What Scrabble words can I make with the letters in decile?
6 Letter Words
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3 Letter Words
2 Letter Words