Dubrovnik vs urban center

Dubrovnik and urban center both are nouns.

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

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