Empire State vs NY

Empire State and NY both are nouns.

Word	Noun	Adjective	Verb	Adverb
Empire State	Yes	No	No	No
NY	Yes	No	No	No

As nouns, Empire State and NY are synonyms defined as:

Empire State and NY: a Mid-Atlantic state; one of the original 13 colonies, with capital Albany

Other synonyms of Empire State include N.Y., New York, New York State.

Empire State (noun)	NY (noun)
a Mid-Atlantic state; one of the original 13 colonies, with capital Albany	a Mid-Atlantic state; one of the original 13 colonies, with capital Albany