urban center vs Springfield

urban center and Springfield both are nouns.

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

urban center (noun)	Springfield (noun)
a large and densely populated urban area; may include several independent administrative districts	capital of the state of Illinois
	a city and manufacturing center in southwestern Massachusetts on the Connecticut River
	a city of southwestern Missouri