military vs combat zone

military and combat zone both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
combat zone	Yes	No	No	No

military (noun)	combat zone (noun)
the military forces of a nation	a military area where combat forces operate
	a city district known for its vice and high crime rate

military (adjective)	combat zone (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