urban center vs Oviedo

urban center and Oviedo both are nouns.

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

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