city vs Chernobyl

city and Chernobyl both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
Chernobyl	Yes	No	No	No

city (noun)	Chernobyl (noun)
people living in a large densely populated municipality	a city in north central Ukraine; site of a major disaster at a nuclear power plant (26 April 1986)
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter