Yes, wow is a Scrabble word!
...and is worth 9 points in Scrabble, and 9 points in Words with Friends
wow
Verb
1. Impress greatly
Noun
1. A joke that seems extremely funny
What Scrabble words can I make with the letters in wow?
2 Letter Words
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Words that can be created with an extra letter added to wow:
S:wows