military vs military volunteer

military and military volunteer both are nouns.

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

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

military (adjective)	military volunteer (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