Jack-tar, mariner, old salt, sea dog, seafarer, seaman, gob, Jack, tar - a man who serves as a sailor

sea captain, skipper, captain, master - an officer who is licensed to command a merchant ship

first mate, mate - the officer below the master on a commercial ship

privateer, privateersman - an officer or crew member of a privateer

purser - an officer aboard a ship who keeps accounts and attends to the passengers' welfare

navigator, sailing master - the ship's officer in charge of navigation

steward - the ship's officer who is in charge of provisions and dining arrangements

supercargo - an officer on a merchant ship in charge of the cargo and its sale and purchase