urban center vs Miami Beach

urban center and Miami Beach both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Miami Beach	Yes	No	No	No

urban center (noun)	Miami Beach (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southeastern Florida on an island between Biscayne Bay and the Atlantic Ocean; known for fashionable resort hotels