The term 'PIRATE's body' can be broken down into two crossword solutions: SEA (3 letters). The word 'SEA' is a noun that refers to a large body of salt water, typically part of an ocean. It is often used to describe the vast expanse of water that covers most of the Earth's surface. In the context of pirates, the SEA is the environment in which they live and operate. It is also the source of their livelihood, as they rely on the bounty of the SEA for their sustenance.