Yes, quieten is a Scrabble word!
...and is worth 16 points in Scrabble, and 18 points in Words with Friends
quieten
Verb
1. Become quiet or quieter
2. Make calm or still
3. Cause to be quiet or not talk
What Scrabble words can I make with the letters in quieten?
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Words that can be created with an extra letter added to quieten:
S:quietens