urban center vs Ragusa

urban center and Ragusa both are nouns.

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

urban center (noun)	Ragusa (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