What Navy term is used to describe a close colleague onboard?

The term "Shipmate" is specifically used within the Navy to denote a close colleague or fellow sailor onboard a ship. This terminology fosters camaraderie and a sense of belonging among those who serve together. The use of "shipmate" emphasizes not only a working relationship but also a bond forged through shared experiences and the unique challenges that come with naval service.

In contrast, while terms like "comrade," "buddy," and "fellow" may convey friendship or companionship, they do not carry the same specific connotation of shared duty and experience that "shipmate" does. "Comrade" often suggests a broader military context, "buddy" is more casual and less exclusive to naval service, and "fellow" lacks the maritime association entirely. Therefore, "shipmate" is the most appropriate term for describing a close colleague in the Navy.