Yes, sass is a Scrabble word!

...and is worth 4 points in Scrabble, and 4 points in Words with Friends

sass

Verb

1. Answer back in an impudent or insolent manner;

Noun

1. An impudent or insolent rejoinder

2. A specialist regiment of the British army that is trained in commando techniques of warfare and used in clandestine operations (especially against terrorist groups)

What Scrabble words can I make with the letters in sass?

2 Letter Words

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Words that can be created with an extra letter added to sass:

Y:sassyE:asses