At Sea Back is a nautical term used to describe the back of a boat or ship. The term is composed of four words: STERN (5 letters), AFT (3 letters), ASTERN (6 letters), and ABAFT (5 letters). STERN refers to the rear of the vessel, AFT is an adverb meaning towards the STERN, ASTERN is an adjective meaning behind the vessel, and ABAFT is an adverb meaning further AFT than. Together, these four words form the phrase At Sea Back, which is used to describe the back of a boat or ship.