USA vs Empire State of the South

USA and Empire State of the South both are nouns.

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

USA (noun)	Empire State of the South (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	a state in southeastern United States; one of the Confederate states during the American Civil War
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776