Aquila degli Abruzzi vs urban center

Aquila degli Abruzzi and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Aquila degli Abruzzi	Yes	No	No	No
urban center	Yes	No	No	No

Aquila degli Abruzzi (noun)	urban center (noun)
the provincial capital of the Abruzzi region in central Italy	a large and densely populated urban area; may include several independent administrative districts