Yes, wart is a Scrabble word!
...and is worth 7 points in Scrabble, and 7 points in Words with Friends
wart
Noun
1. Any small rounded protuberance (as on certain plants or animals)
2. An imperfection in someone or something that is suggestive of a wart (especially in smallness or unattractiveness)
3. (pathology) a firm abnormal elevated blemish on the skin; caused by a virus
What Scrabble words can I make with the letters in wart?
3 Letter Words
2 Letter Words