Yes, win is a Scrabble word!
...and is worth 6 points in Scrabble, and 7 points in Words with Friends
win
Verb
1. Be the winner in a contest or competition; be victorious
2. Win something through one's efforts
3. Obtain advantages, such as points, etc.
4. Attain success or reach a desired goal
Noun
1. A victory (as in a race or other competition)
2. Something won (especially money)
What Scrabble words can I make with the letters in win?
2 Letter Words