urban center vs Birmingham

urban center and Birmingham both are nouns.

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

urban center (noun)	Birmingham (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in central England; 2nd largest English city and an important industrial and transportation center
	the largest city in Alabama; located in northeastern Alabama