Is “Unbirthday” a Scrabble word?
Yes
UNBIRTHDAY
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 Unbirthday
noun
1.A day that is not one's birthday but is celebrated as though it were.