Wuerzburg vs urban center

Wuerzburg and urban center both are nouns.

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

Wuerzburg (noun)	urban center (noun)
a city of south central Germany	a large and densely populated urban area; may include several independent administrative districts