Yes, skill is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
skill
Noun
1. An ability that has been acquired by training
2. Ability to produce solutions in some problem domain
What Scrabble words can I make with the letters in skill?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words