Yes, dumbfound is a Scrabble word!
...and is worth 18 points in Scrabble, and 23 points in Words with Friends
dumbfound
Verb
1. Be a mystery or bewildering to
What Scrabble words can I make with the letters in dumbfound?
8 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words