USA vs Tar Heel State

USA and Tar Heel State both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
Tar Heel State	Yes	No	No	No

USA (noun)	Tar Heel State (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 original 13 colonies
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