military vs army officer

military and army officer both are nouns.

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

military (noun)	army officer (noun)
the military forces of a nation	an officer in the armed forces

military (adjective)	army officer (adjective)
associated with or performed by members of the armed services as contrasted with civilians
characteristic of or associated with soldiers or the military
of or relating to the study of the principles of warfare