middle west vs USA

middle west and USA both are nouns.

Word	Noun	Adjective	Verb	Adverb
middle west	Yes	No	No	No
USA	Yes	No	No	No

middle west (noun)	USA (noun)
the north central region of the United States (sometimes called the heartland or the breadbasket of America)	the army of the United States of America; the agency that organizes and trains soldiers for land warfare
	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