America's Cup Vessel is a term used to describe the YACHT that is used in the America's Cup, an international sailing competition. The five-letter word for this vessel is 'YACHT'. Yachts are typically large, luxurious sailing vessels that are used for recreational purposes. They are often equipped with multiple sails and have a long, slender hull. The America's Cup is a prestigious sailing event that has been held since 1851 and is considered to be one of the oldest and most prestigious sailing competitions in the world.