Yes, prevent is a Scrabble word!
...and is worth 12 points in Scrabble, and 15 points in Words with Friends
prevent
Verb
1. Keep from happening or arising; make impossible
2. Stop (someone or something) from doing something or being in a certain state
What Scrabble words can I make with the letters in prevent?
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Words that can be created with an extra letter added to prevent:
S:prevents