urban center vs Miami

urban center and Miami both are nouns.

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

urban center (noun)	Miami (noun)
a large and densely populated urban area; may include several independent administrative districts	a city and resort in southeastern Florida on Biscayne Bay; the best known city in Florida; a haven for retirees and a refuge for Cubans fleeing Castro
	a member of the extinct Algonquian people formerly living in northern Indiana and southern Michigan