Mid-Atlantic states vs America

Mid-Atlantic states and America both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mid-Atlantic states	Yes	No	No	No
America	Yes	No	No	No

Mid-Atlantic states (noun)	America (noun)
a region of the eastern United States comprising New York and New Jersey and Pennsylvania and Delaware and Maryland	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
	North America and South America and Central America