Glossary Category Ship Construction Glossary terms relating to ship construction. Terms Ballast Tank Bilge Bilge Pump Bulkhead Deck Camber Deck Beam Displacement Double Hull Draft (Ship) Frame (Ship) Freeboard Hull Plating Keel Plate Keelson Longitudinal Framing Sheer Line Stringer Superstructure Transverse Framing Watertight Compartment