military vs military service

military and military service both are nouns.

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

military (noun)	military service (noun)
the military forces of a nation	land tenure by service in the lord's army
	a force that is a branch of the armed forces

military (adjective)	military 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