Yes, den is a Scrabble word!
...and is worth 4 points in Scrabble, and 5 points in Words with Friends
den
Noun
1. The habitation of wild animals
2. A hiding place; usually a remote place used by outlaws
3. A unit of 8 to 10 cub scouts
4. A room that is comfortable and secluded
What Scrabble words can I make with the letters in den?
3 Letter Words
2 Letter Words