military volunteer vs military

military volunteer and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
military volunteer	Yes	No	No	No
military	Yes	Yes	No	No

military volunteer (noun)	military (noun)
(military) a person who freely enlists for service	the military forces of a nation

military volunteer (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