Columbus vs city

Columbus and city both are nouns.

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

Columbus (noun)	city (noun)
the state capital of Ohio; located in the center of the state; site of Ohio State University	people living in a large densely populated municipality
a city in western Georgia on the Chattahoochee River; industrial center	a large and densely populated urban area; may include several independent administrative districts
a town in eastern Mississippi near the border with Alabama	an incorporated administrative district established by state charter
Italian navigator who discovered the New World in the service of Spain while looking for a route to China (1451-1506)