W4H4A1L1E1B3A1C3K5S1
24 points
WHALEBACKS is validvalid
WHALEBACK,
WHALEBACK, a kind of steamboat used on the Great Lakes to carry grain, etc. having a rounded upper deck
WHALEBACK,
WHALEBACK, a kind of steamboat used on the Great Lakes to carry grain, etc. having a rounded upper deck