Is “Backgammon” a Scrabble word?
Yes
BACKGAMMON
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 Backgammon
/ˈbæk.ɡæm.ən/
noun
1.A board game for two players in which each has 15 stones which move between 24 triangular points according to the roll of a pair of dice; the object is to move all of one's pieces around, and bear them off the board.
2.A victory in the game when the loser has not borne off a stone, and still has one or more stones in the winner's inner home row or on the bar.
verb
1.To win at a backgammon game with the opponent having one or more pieces in the winner’s inner home row or on the bar.