urban center vs New York City

urban center and New York City both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
New York City	Yes	No	No	No

urban center (noun)	New York City (noun)
a large and densely populated urban area; may include several independent administrative districts	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