ship's officer vs tar

ship's officer and tar both are nouns.

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

As nouns, tar is a hypernym of ship's officer; that is, tar 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
tar: a man who serves as a sailor

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

ship's officer (noun)	tar (noun)
a person authorized to serve in a position of authority on a vessel	a man who serves as a sailor
	any of various dark heavy viscid substances obtained as a residue

ship's officer (verb)	tar (verb)
	coat with tar