Deep South vs South

Deep South and South both are nouns.

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

Deep South (noun)	South (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	the southern states that seceded from the United States in 1861
	the region of the United States lying to the south of the Mason-Dixon line