commander vs military officer

commander and military officer both are nouns.

Word	Noun	Adjective	Verb	Adverb
commander	Yes	No	No	No
military officer	Yes	No	No	No

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

commander: an officer in command of a military unit
military officer: any person in the armed services who holds a position of authority or command

Other hypernyms of commander include officer.

commander (noun)	military officer (noun)
an officer in command of a military unit	any person in the armed services who holds a position of authority or command
a commissioned naval officer who ranks above a lieutenant commander and below a captain
an officer in the airforce
someone in an official position of authority who can command or control others