Oviedo vs urban center

Oviedo and urban center both are nouns.

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

Oviedo (noun)	urban center (noun)
a city in northwestern Spain near the Cantabrian Mountains	a large and densely populated urban area; may include several independent administrative districts