Yes, viper is a Scrabble word!
...and is worth 10 points in Scrabble, and 12 points in Words with Friends
viper
Noun
1. Venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw
What Scrabble words can I make with the letters in viper?
4 Letter Words
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3 Letter Words
2 Letter Words