Yes, chummy is a Scrabble word!
...and is worth 18 points in Scrabble, and 20 points in Words with Friends
chummy
Adjective
1. (used colloquially) having the relationship of friends or pals
2. (used informally) associated on close terms
What Scrabble words can I make with the letters in chummy?
4 Letter Words
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3 Letter Words
2 Letter Words