Yes, whacky is a Scrabble word!
...and is worth 21 points in Scrabble, and 20 points in Words with Friends
whacky
Adjective
1. Ludicrous, foolish
2. Informal or slang terms for mentally irregular
What Scrabble words can I make with the letters in whacky?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words