W4A1T1E1R1B3U1S1
13 points
WATERBUS is validvalid
a large motorboat for carrying passengers [n WATERBUSES, WATERBUSSES]
a large motorboat for carrying passengers [n WATERBUSES or WATERBUSSES]
a large motorboat for carrying passengers [n WATERBUSES, WATERBUSSES]
a large motorboat for carrying passengers [n WATERBUSES or WATERBUSSES]