Yes, quell is a Scrabble word!
...and is worth 14 points in Scrabble, and 17 points in Words with Friends
quell
Verb
1. Suppress or crush completely
2. Overcome or allay
What Scrabble words can I make with the letters in quell?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to quell:
S:quells