city vs Mesa

city and Mesa both are nouns.

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

city (noun)	Mesa (noun)
people living in a large densely populated municipality	a city in Arizona just to the east of Phoenix; originally a suburb of Phoenix
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter