national service vs military

national service and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
national service	Yes	No	No	No
military	Yes	Yes	No	No

national service (noun)	military (noun)
compulsory service in the military during peacetime	the military forces of a nation

national service (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