theatre vs ticket office

theatre and ticket office both are nouns.

Word	Noun	Adjective	Verb	Adverb
theatre	Yes	No	No	No
ticket office	Yes	No	No	No

theatre (noun)	ticket office (noun)
a building where theatrical performances or motion-picture shows can be presented	the office where tickets of admission are sold
the art of writing and producing plays
a region in which active military operations are in progress