The parts/description are the same for nearly all naval submarines: Conning tower, Fin, diving planes, aft, fore, periscope, torpedo tubes, deck gun, screw(s) (propellers), rudder, etc.
U boat is used for German submarines in both World Wars. It is a translation of German U-Boot which is short for Unterseeboot. A U-Boat is the English expression for the German U-Boot (these...