urban center vs Shiraz

urban center and Shiraz both are nouns.

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

urban center (noun)	Shiraz (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in central southwestern Iran; ruins of ancient Persepolis are nearby