Yes, buttock is a Scrabble word!
...and is worth 15 points in Scrabble, and 18 points in Words with Friends
buttock
Noun
1. Either of the two large fleshy masses of muscular tissue that form the human rump
What Scrabble words can I make with the letters in buttock?
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Words that can be created with an extra letter added to buttock:
S:buttocks