urban center vs Kharkov

urban center and Kharkov both are nouns.

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

urban center (noun)	Kharkov (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in northeastern Ukraine; former capital of the Ukraine