Yes, thriven is a Scrabble word!
...and is worth 13 points in Scrabble, and 14 points in Words with Friends
thriven
Verb
1. Grow vigorously
2. Make steady progress; be at the high point in one's career or reach a high point in historical significance or importance
What Scrabble words can I make with the letters in thriven?
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Words that can be created with an extra letter added to thriven:
O:overthin