Mid-Atlantic states vs New York State

Mid-Atlantic states and New York State both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mid-Atlantic states	Yes	No	No	No
New York State	Yes	No	No	No

Mid-Atlantic states (noun)	New York State (noun)
a region of the eastern United States comprising New York and New Jersey and Pennsylvania and Delaware and Maryland	a Mid-Atlantic state; one of the original 13 colonies, with capital Albany