combat area vs theater

combat area and theater both are nouns.

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

combat area (noun)	theater (noun)
a military area where combat forces operate	a building where theatrical performances or motion-picture shows can be presented
	the art of writing and producing plays
	a region in which active military operations are in progress