urban center vs Adrianopolis

urban center and Adrianopolis both are nouns.

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

urban center (noun)	Adrianopolis (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in northwestern Turkey; a Thracian town that was rebuilt and renamed by the Roman Emperor Hadrian