Deep South vs geographic area

Deep South and geographic area both are nouns.

Word	Noun	Adjective	Verb	Adverb
Deep South	Yes	No	No	No
geographic area	Yes	No	No	No

Deep South (noun)	geographic area (noun)
the southeastern region of the United States: South Carolina and Georgia and Alabama and Mississippi and Louisiana; prior to the American Civil War all these states produced cotton and permitted slavery	a demarcated area of the Earth