urban center vs Dubrovnik

urban center and Dubrovnik both are nouns.

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

urban center (noun)	Dubrovnik (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city in southwestern Croatia on the Adriatic; a popular tourist center