metropolis vs Miami Beach

metropolis and Miami Beach both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Miami Beach	Yes	No	No	No

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