Men-of-war is a term primarily used to describe a large and powerful warship. However, there are several synonyms that can be used to describe this type of ship, including battleship, warship, cruiser, destroyer, and frigate. Each has its own specific characteristics and usage, but they all share the common purpose of engaging in warfare. Some other related terms that can be used instead of men-of-war include naval vessel, warcraft, and combat ship. These synonyms are often used in historical contexts to describe the various types of warships that have been used throughout history to protect their respective nations' interests.