The words "sailors", "seamen", and "mariners" are all synonyms for the term "jack-tars". This term is often used to describe individuals who work on ships or boats, particularly those in the navy. The word "jack" is thought to be a reference to sailors who used to wear a type of jacket called a "jack-et". Meanwhile, "tar" is a reference to the tar used to seal the wooden ships. Overall, regardless of the term used, these individuals are an important part of maritime history and continue to play a vital role in the shipping industry today.