Miami Beach vs metropolis

Miami Beach and metropolis both are nouns.

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

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