USA vs American state

USA and American state both are nouns.

Word	Noun	Adjective	Verb	Adverb
USA	Yes	No	No	No
American state	Yes	No	No	No

USA (noun)	American state (noun)
the army of the United States of America; the agency that organizes and trains soldiers for land warfare	one of the 50 states of the United States
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