military law vs military

military law and military both are nouns.

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

military law (noun)	military (noun)
the body of laws and rules of conduct administered by military courts for the discipline, trial, and punishment of military personnel	the military forces of a nation

military law (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