military reserve vs military

military reserve and military both are nouns.

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

As nouns, military is a hypernym of military reserve; that is, military is a word with a broader meaning than military reserve:

military reserve: armed forces that are not on active duty but can be called in an emergency
military: the military forces of a nation

Other hypernyms of military reserve include armed forces, armed services, military machine, war machine.

military reserve (noun)	military (noun)
armed forces that are not on active duty but can be called in an emergency	the military forces of a nation

military reserve (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