seafarer vs officer

seafarer and officer both are nouns.

Word	Noun	Adjective	Verb	Adverb
seafarer	Yes	No	No	No
officer	Yes	No	Yes	No

As nouns, officer is a hyponym of seafarer; that is, officer is a word with a more specific, narrower meaning than seafarer:

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

seafarer (noun)	officer (noun)
a man who serves as a sailor	a member of a police force
	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

seafarer (verb)	officer (verb)
	direct or command as an officer