urban center vs Odesa

urban center and Odesa both are nouns.

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

urban center (noun)	Odesa (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city of south central Ukraine on an arm of the Black Sea