urban center vs Brno

urban center and Brno both are nouns.

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

urban center (noun)	Brno (noun)
a large and densely populated urban area; may include several independent administrative districts	an industrial city in Moravia in Czech Republic to the southeast of Prague