East River vs Greater New York

East River and Greater New York both are nouns.

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

East River (noun)	Greater New York (noun)
a tidal strait separating Manhattan and the Bronx from Queens and Brooklyn	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