There are several synonyms for the term "sailor king" depending on the context and usage. One term that is often used as a synonym is the phrase "naval commander." This describes a leader who commands a fleet or a group of naval vessels. Another synonym for "sailor king" is the word "maritime monarch," which is used to describe a powerful leader who dominates the seas. Another synonym for "sailor king" is "nautical ruler," which is often used to describe a leader with a passion for sailing and a reputation for being an expert in all things nautical. Ultimately, the choice of synonym will depend on the specific meaning and context of the term.