city vs Fresno

city and Fresno both are nouns.

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

city (noun)	Fresno (noun)
people living in a large densely populated municipality	a city in south central California in the San Joaquin Valley; center of an important agricultural area and gateway to the Sierra Nevada Mountains
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter