USA vs Buckeye State

USA and Buckeye State both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
Buckeye State	Yes	No	No	No

USA (noun)	Buckeye State (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	a midwestern state in north central United States in the Great Lakes region, with capital Columbus
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