Is “Adder” a Scrabble word?
Yes
ADDER
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 Adder
noun
1.Any snake.
2.A name loosely applied to various snakes more or less resembling the viper; a viper.