The term 'Fleet Part' can be broken down into two crossword solutions: BOAT (4 letters) and SQUADRON (8 letters). A BOAT is a small watercraft, typically used for recreational activities such as fishing or pleasure cruises. A SQUADRON is a unit of military aircraft, typically consisting of several divisions of planes. In the context of a fleet, a BOAT would be a smaller vessel that is part of a larger group of ships, while a SQUADRON would be a group of aircraft that are part of a larger air force.