Yes, jiao is a Scrabble word!
...and is worth 11 points in Scrabble, and 13 points in Words with Friends
jiao
Noun
1. 10 jiao equal 1 yuan in China
What Scrabble words can I make with the letters in jiao?
2 Letter Words
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Words that can be created with an extra letter added to jiao:
R:rioja