HMS Hermes was to be one of the Centaur class light fleet carriers designed in WW2, but not completed at the end of the war, she was no longer needed.
Designed in 1942, the 16 of these ships were designed as smaller carriers that could be built rapidly. Only ten were completed before the end of WW2, eight in the designed role, the following two were completed as aircraft maintenance ships, none saw front line service in WW2.
The Kitty Hawk, Constellation, America and the John F Kennedy were the last conventionally powered super carriers built for the United States Navy. All these ships were built in the 1960's as improvements over the previous Forrestal class carriers.