officer vs sea dog

officer and sea dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
officer	Yes	No	Yes	No
sea dog	Yes	No	No	No

As nouns, sea dog is a hypernym of officer; that is, sea dog is a word with a broader meaning than officer:

officer: a person authorized to serve in a position of authority on a vessel
sea dog: a man who serves as a sailor

Other hypernyms of officer include gob, Jack-tar, Jack, mariner, old salt, seafarer, seaman, tar.

officer (noun)	sea dog (noun)
a member of a police force	a man who serves as a sailor
someone who is appointed or elected to an office and who holds a position of trust
any person in the armed services who holds a position of authority or command
a person authorized to serve in a position of authority on a vessel

officer (verb)	sea dog (verb)
direct or command as an officer