Yes, jammies is a Scrabble word!
...and is worth 18 points in Scrabble, and 22 points in Words with Friends
jammies
Noun
1. (usually plural) loose-fitting nightclothes worn for sleeping or lounging; have a jacket top and trousers
What Scrabble words can I make with the letters in jammies?
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Words that can be created with an extra letter added to jammies:
T:jammiest