Yes, zippiest is a Scrabble word!
...and is worth 21 points in Scrabble, and 23 points in Words with Friends
zippiest
Adjective
1. Quick and energetic
2. Marked by lively action
What Scrabble words can I make with the letters in zippiest?
7 Letter Words
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words