metropolis vs Tucson

metropolis and Tucson both are nouns.

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

metropolis (noun)	Tucson (noun)
people living in a large densely populated municipality	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
a large and densely populated urban area; may include several independent administrative districts