executive officer vs officer

executive officer and officer both are nouns.

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

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

executive officer: the officer second in command
officer: any person in the armed services who holds a position of authority or command

Other hypernyms of executive officer include military officer.

executive officer (noun)	officer (noun)
the officer second in command	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

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