city vs Mexicali

city and Mexicali both are nouns.

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

city (noun)	Mexicali (noun)
people living in a large densely populated municipality	a city in northwestern Mexico near the California border
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter