The term PERTH PAL is a job title for a MATE, which is a four letter word. A MATE is a person who assists the captain of a ship in navigating and managing the crew. They are responsible for ensuring the safety of the ship and its passengers, as well as helping to maintain the vessel. The MATE is also responsible for overseeing the loading and unloading of cargo, and providing assistance with any repairs or maintenance that may be needed.