Yes, diadem is a Scrabble word!
...and is worth 10 points in Scrabble, and 11 points in Words with Friends
diadem
Noun
1. An ornamental jeweled headdress signifying sovereignty
What Scrabble words can I make with the letters in diadem?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words