Yes, seder is a Scrabble word!
...and is worth 6 points in Scrabble, and 6 points in Words with Friends
seder
Noun
1. (Judaism) the ceremonial dinner on the first night (or both nights) of Passover
What Scrabble words can I make with the letters in seder?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words