Smolensk vs urban center

Smolensk and urban center both are nouns.

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

Smolensk (noun)	urban center (noun)
a city in western Russia on the Dnieper River; scene of severe fighting in World War II	a large and densely populated urban area; may include several independent administrative districts