This is a joke to not put the Yamato and her sister ship the Musashi first. They were easily the two most powerful battleships to ever sail. 72,000 tons combat displacement and armed with 18 inch naval rifles, they were bigger and better armed than any other battleships in history.
The Iowa class battleships would be next. They were the next biggest and had 16 inch naval rifles and at 60,000 tons, were the next largest.
The next would probably be Bismarck and Tirpitz. They were each 50,000 tons and had 15 inch naval rifles.
The next is one that just missed World War II. HMS Vanguard was completed just after the war. She was 45,000 tons and had 15 inch naval rifles.
After that, take your pick.
All rep, no service. Claim to fame in battle was how much punishment they soaked up before sinking.
Biggest battleship disaster, HMS Hood.