combat zone vs theater

combat zone and theater both are nouns.

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

combat zone (noun)	theater (noun)
a military area where combat forces operate	a building where theatrical performances or motion-picture shows can be presented
a city district known for its vice and high crime rate	the art of writing and producing plays
	a region in which active military operations are in progress