city vs Casper

city and Casper both are nouns.

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

city (noun)	Casper (noun)
people living in a large densely populated municipality	a city of east central Wyoming on the North Platte river
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter