city vs Nantes

city and Nantes both are nouns.

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

city (noun)	Nantes (noun)
people living in a large densely populated municipality	a port city in western France on the Loire estuary
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter