officer vs old salt

officer and old salt both are nouns.

Word	Noun	Adjective	Verb	Adverb
officer	Yes	No	Yes	No
old salt	Yes	No	No	No

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

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

Other hypernyms of officer include gob, Jack-tar, Jack, mariner, sea dog, seafarer, seaman, tar.

officer (noun)	old salt (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)	old salt (verb)
direct or command as an officer