Empire State of the South vs Flint River

Empire State of the South and Flint River both are nouns.

Word	Noun	Adjective	Verb	Adverb
Empire State of the South	Yes	No	No	No
Flint River	Yes	No	No	No

Empire State of the South (noun)	Flint River (noun)
a state in southeastern United States; one of the Confederate states during the American Civil War	a river in western Georgia that flows generally south to join the Chattahoochee River at the Florida border where they form the Apalachicola River