commandant vs military officer

commandant and military officer both are nouns.

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

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

commandant: 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 commandant include officer.

commandant (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