Yes, opine is a Scrabble word!
...and is worth 7 points in Scrabble, and 9 points in Words with Friends
opine
Verb
1. Express one's opinion openly and without fear or hesitation
2. Expect, believe, or suppose
What Scrabble words can I make with the letters in opine?
4 Letter Words
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3 Letter Words
2 Letter Words