Yes, wacky is a Scrabble word!
...and is worth 17 points in Scrabble, and 17 points in Words with Friends
wacky
Adjective
1. Ludicrous, foolish
2. Informal or slang terms for mentally irregular
What Scrabble words can I make with the letters in wacky?
4 Letter Words
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Words that can be created with an extra letter added to wacky:
H:whacky