officer vs seaman

officer and seaman both are nouns.

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

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

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

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

officer (noun)	seaman (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)	seaman (verb)
direct or command as an officer