Empire State of the South vs Chattahoochee River

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

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

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