A sea dog is a term used to describe a SAILOR or MARINER who has been at sea for a long time. The crossword solutions for the term SEA DOG include TAR (3 letters), ROVER (5 letters), MARINER (7 letters), PIRATE (6 letters), GOB (3 letters), SALT (4 letters), SAILOR (6 letters), OLDSALT (7 letters), and OLDSAILOR (9 letters). These words all refer to a person who has spent a significant amount of time at sea, and can be used to describe a variety of seafaring roles, from PIRATE to SAILOR to MARINER.