Yes, qi is a Scrabble word!
...and is worth 11 points in Scrabble, and 11 points in Words with Friends
qi
Noun
1. The circulating life energy that in Chinese philosophy is thought to be inherent in all things; in traditional Chinese medicine the balance of negative and positive forms in the body is believed to be essential for good health
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Words that can be created with an extra letter added to qi:
S:qis