Yes, spook is a Scrabble word!
...and is worth 11 points in Scrabble, and 12 points in Words with Friends
spook
Verb
1. Frighten or scare, and often provoke into a violent action
Noun
1. Someone unpleasantly strange or eccentric
2. A mental representation of some haunting experience
What Scrabble words can I make with the letters in spook?
4 Letter Words
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3 Letter Words
2 Letter Words