Yes, mitt is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
mitt
Noun
1. The (prehensile) extremity of the superior limb
2. The handwear used by fielders in playing baseball
What Scrabble words can I make with the letters in mitt?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to mitt:
S:mitts