dramatic art vs theatre

dramatic art and theatre both are nouns.

Word	Noun	Adjective	Verb	Adverb
dramatic art	Yes	No	No	No
theatre	Yes	No	No	No

As nouns, dramatic art and theatre are synonyms defined as:

Other synonyms of dramatic art include dramatics, dramaturgy, theater.

dramatic art (noun)	theatre (noun)
the art of writing and producing plays	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