Nijmegen vs urban center

Nijmegen and urban center both are nouns.

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

Nijmegen (noun)	urban center (noun)
an industrial city in the eastern Netherlands	a large and densely populated urban area; may include several independent administrative districts