theater vs communicating

theater and communicating both are nouns.

Word	Noun	Adjective	Verb	Adverb
theater	Yes	No	No	No
communicating	Yes	No	No	No

As nouns, communicating is a hypernym of theater; that is, communicating is a word with a broader meaning than theater:

theater: the art of writing and producing plays
communicating: the activity of communicating; the activity of conveying information

Other hypernyms of theater include communication.

theater (noun)	communicating (noun)
a building where theatrical performances or motion-picture shows can be presented	the activity of communicating; the activity of conveying information
the art of writing and producing plays
a region in which active military operations are in progress