Yes, dumber is a Scrabble word!
...and is worth 11 points in Scrabble, and 14 points in Words with Friends
dumber
Adjective
1. Slow to learn or understand; lacking intellectual acuity
2. Temporarily incapable of speaking
3. Lacking the power of human speech
4. Unable to speak because of hereditary deafness
What Scrabble words can I make with the letters in dumber?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words