Yes, deepen is a Scrabble word!
...and is worth 9 points in Scrabble, and 11 points in Words with Friends
deepen
Verb
1. Make more intense, stronger, or more marked
2. Become more intense
3. Make deeper
4. Become deeper in tone
What Scrabble words can I make with the letters in deepen?
6 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words