Yes, usurps is a Scrabble word!
...and is worth 8 points in Scrabble, and 11 points in Words with Friends
usurps
Verb
1. Seize and take control without authority and possibly with force; take as one's right or possession
2. Take the place of
What Scrabble words can I make with the letters in usurps?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words