Yes, mows is a Scrabble word!
...and is worth 9 points in Scrabble, and 10 points in Words with Friends
mows
Verb
1. Cut with a blade or mower
2. Make a sad face and thrust out one's lower lip
Noun
1. A loft in a barn where hay is stored
What Scrabble words can I make with the letters in mows?
3 Letter Words
2 Letter Words