war zone vs armed services

war zone and armed services both are nouns.

Word	Noun	Adjective	Verb	Adverb
war zone	Yes	No	No	No
armed services	Yes	No	No	No

war zone (noun)	armed services (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