Ship's officer and Sea dog

Ship's officer noun - A person authorized to serve in a position of authority on a vessel.

Sea dog and ship's officer are semantically related. In some cases you can use "Sea dog" instead a noun phrase "Ship's officer".

Sea dog noun - One who operates or navigates a seagoing vessel.

Ship's officer and sea dog are semantically related. Sometimes you can replace phrase "Ship's officer" with "Sea dog", this phrases are similar.