Tucson vs city

Tucson and city both are nouns.

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

Tucson (noun)	city (noun)
a city in southeastern Arizona ringed by mountain ranges; long known as a winter and health resort but the population shift from industrial states to the Sunbelt resulted in rapid growth late in the 20th century	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter