theater vs combat area

theater and combat area both are nouns.

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

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