urban center vs Siracusa

urban center and Siracusa both are nouns.

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

urban center (noun)	Siracusa (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southeastern Sicily that was founded by Corinthians in the 8th century BC