Yes, sacs is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
sacs
Noun
1. An enclosed space
2. A case or sheath especially a pollen sac or moss capsule
3. A member of the Algonquian people formerly living in Wisconsin in the Fox River valley and on the shores of Green Bay
4. A structure resembling a bag in an animal
What Scrabble words can I make with the letters in sacs?
3 Letter Words
2 Letter Words