Yes, excel is a Scrabble word!
...and is worth 14 points in Scrabble, and 16 points in Words with Friends
excel
Verb
1. Distinguish oneself
What Scrabble words can I make with the letters in excel?
4 Letter Words
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3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to excel:
S:excels