Springfield vs urban center

Springfield and urban center both are nouns.

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

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