military vs flag officer

military and flag officer both are nouns.

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

military (noun)	flag officer (noun)
the military forces of a nation	a senior naval officer above the rank of captain

military (adjective)	flag 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