ticket office vs theater

ticket office and theater both are nouns.

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

ticket office (noun)	theater (noun)
the office where tickets of admission are sold	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