Is “Whaleback” a Scrabble word?
Yes
WHALEBACK
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 Whaleback
noun
1.A kind of cargo steamship with a hull that continuously curved above the waterline from vertical to horizontal
2.A land form (typically a sand dune) having the form of the back of a whale