military vs national service

military and national service both are nouns.

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

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

military (adjective)	national service (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