Yes, surtax is a Scrabble word!
...and is worth 13 points in Scrabble, and 14 points in Words with Friends
surtax
Verb
1. Levy an extra tax on
Noun
1. An additional tax on certain kinds of income that has already been taxed
What Scrabble words can I make with the letters in surtax?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words