Greater New York vs Harlem River

Greater New York and Harlem River both are nouns.

Word	Noun	Adjective	Verb	Adverb
Greater New York	Yes	No	No	No
Harlem River	Yes	No	No	No

Greater New York (noun)	Harlem River (noun)
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	a channel separating Manhattan from the Bronx