Is “Seder” a Scrabble word?
Yes
SEDER
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Seder
/ˈseɪdə/
noun
1.The ceremonial meal held on the first night or two nights of Passover.
2.One of the 54 parts into which the Torah is divided.