urban center vs Chernobyl

urban center and Chernobyl both are nouns.

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

urban center (noun)	Chernobyl (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in north central Ukraine; site of a major disaster at a nuclear power plant (26 April 1986)