staff officer vs military

staff officer and military both are nouns.

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

staff officer (noun)	military (noun)
a commissioned officer assigned to a military commander's staff	the military forces of a nation

staff officer (adjective)	military (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