Yes, zipper is a Scrabble word!
...and is worth 19 points in Scrabble, and 21 points in Words with Friends
zipper
Verb
1. Close with a zipper
Noun
1. A fastener for locking together two toothed edges by means of a sliding tab
What Scrabble words can I make with the letters in zipper?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words