The term boatswain is a nautical term used to describe a senior non-commissioned officer in charge of the crew and equipment on a ship. The two crossword solutions for this term are BOSUN (5 letters) and SERANG (6 letters). BOSUN is an abbreviation of boatswain, while SERANG is an Indonesian word derived from the same root. Both terms refer to the same job description, which is a senior non-commissioned officer in charge of the crew and equipment on a ship.