N.Y. vs New York City

N.Y. and New York City both are nouns.

Word	Noun	Adjective	Verb	Adverb
N.Y.	Yes	No	No	No
New York City	Yes	No	No	No

N.Y. (noun)	New York City (noun)
a Mid-Atlantic state; one of the original 13 colonies, with capital Albany	the largest city in New York State and in the United States; located in southeastern New York at the mouth of the Hudson river; a major financial and cultural center