The term 'Pirate REALM' can be broken down into two crossword solutions: SEA (3 letters). SEA stands for the body of salt water that covers most of the Earth's surface and is home to many aquatic creatures. It is also the primary habitat of pirates, who use it as a base for their operations. The term 'REALM' refers to a kingdom or domain, which in this case is the domain of the pirates. Together, the two words form the phrase 'Pirate REALM, ' which describes the area of the world where pirates operate and live.