1) Bac 2) Ferry 1) Boat 2) Ferry 3) It goes from bank to bank 4) Mersey crosser 
• (n.) A vessel for conveying passengers, merchandise, etc., across streams and other narrow waters.
(from the article `ship`) Ferries are vessels of any size that carry passengers and (in many cases) their vehicles on fixed routes over short cross-water passages. The ... Operations on which air-cushion vehicles have been used have been largely confined to commercial passenger-carrying ferry services across stretches ... The princip...
Fer'ry·boat` noun A vessel for conveying passengers, merchandise, etc., across streams and other narrow waters.