Odessa vs urban center

Odessa and urban center both are nouns.

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

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