Siracusa vs urban center

Siracusa and urban center both are nouns.

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

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