war zone vs military machine

war zone and military machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
war zone	Yes	No	No	No
military machine	Yes	No	No	No

war zone (noun)	military machine (noun)
a combat zone where military operations are coordinated (especially a designated area in international waters where the rights of neutrals are not respected by nations at war)	the military forces of a nation