Yes, vain is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
vain
Adjective
1. Characteristic of false pride; having an exaggerated sense of self-importance
2. Unproductive of success
What Scrabble words can I make with the letters in vain?
4 Letter Words
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3 Letter Words
2 Letter Words