Gulf Coast of the United States vs South

Gulf Coast of the United States and South both are nouns.

Word	Noun	Adjective	Verb	Adverb
Gulf Coast of the United States	Yes	No	No	No
South	Yes	No	No	No

Gulf Coast of the United States (noun)	South (noun)
a region of the United States comprising states bordering the Gulf of Mexico; Alabama and Florida and Louisiana and Mississippi and Texas	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