city vs Genf

city and Genf both are nouns.

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

city (noun)	Genf (noun)
people living in a large densely populated municipality	a city in southwestern Switzerland at the western end of Lake Geneva; it is the headquarters of various international organizations
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter