ship's officer vs gob

ship's officer and gob both are nouns.

Word	Noun	Adjective	Verb	Adverb
ship's officer	Yes	No	No	No
gob	Yes	No	No	No

As nouns, gob is a hypernym of ship's officer; that is, gob is a word with a broader meaning than ship's officer:

ship's officer: a person authorized to serve in a position of authority on a vessel
gob: a man who serves as a sailor

Other hypernyms of ship's officer include Jack-tar, Jack, mariner, old salt, sea dog, seafarer, seaman, tar.

ship's officer (noun)	gob (noun)
a person authorized to serve in a position of authority on a vessel	informal terms for the mouth
	a lump of slimy stuff
	a man who serves as a sailor