The only 2 navies that mattered in WW1 were those of Britain and Germany. The most advanced type of warship was the Dreadnought,a type of heavily armed battleship.Dreadnoughts were more or less generic across the navies of all nations,so were very similar in terms of armament,armour,and speed. The German navy maintained 12" guns as the main armament of their Dreadnoughts after other navies had switched to 14" or 15" guns as main armament.
The most powerful Dreadnoughts afloat in WW1 were the Royal Sovereign Class of the Royal Navy,launched 1n 1916 and 1917:
HMS Royal Sovereign.
HMS Royal Oak.
These were oil powered ships with main armament 8 x 15" secondary armament 14 x 6" with belt armour of 13.1".
Most powerful German Dreadnoughts were the Konig Class, completed 1914:
Steam powered ships, main armament 10 x 12" secondary armament 14 x 3.9" belt armour 14.3"
The U.S.S. Constitution, Old Ironsides, H.M.S. Eddie
USA was nothing in world war I, sorry guys. It was all Britian, France, and Canada.
The Bismarck was the most heavily armed and most feared by the British so they hunted it down. It was a German battleship.