Yes, sash is a Scrabble word!
...and is worth 7 points in Scrabble, and 6 points in Words with Friends
sash
Noun
1. A framework that holds the panes of a window in the window frame
2. A band of material around the waist that strengthens a skirt or trousers
What Scrabble words can I make with the letters in sash?
3 Letter Words
2 Letter Words