Ship of the line is a term typically used to describe massive warships used in naval warfare. However, there are many synonyms for this term that are also used in various contexts. Some of the most common synonyms for ship of the line include man-of-war, capital ship, battleship, and cruiser. Each of these terms carries its own unique connotation and history, making it important to choose the right synonym depending on the context in which it is being used. For example, the term man-of-war is often used to describe the large sailing ships used during the age of sail, while cruiser typically refers to a more modern warship designed for long-range operations.