Yes, whacks is a Scrabble word!
...and is worth 18 points in Scrabble, and 18 points in Words with Friends
whacks
Verb
1. Hit hard
Noun
1. The sound made by a sharp swift blow
2. The act of hitting vigorously
What Scrabble words can I make with the letters in whacks?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words