Yes, avow is a Scrabble word!
...and is worth 10 points in Scrabble, and 11 points in Words with Friends
avow
Verb
1. To declare or affirm solemnly and formally as true
2. Admit openly and bluntly; make no bones about
What Scrabble words can I make with the letters in avow?
3 Letter Words
2 Letter Words
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Words that can be created with an extra letter added to avow:
S:avows