metropolis vs Amarillo

metropolis and Amarillo both are nouns.

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

metropolis (noun)	Amarillo (noun)
people living in a large densely populated municipality	a city in the northern panhandle of Texas
a large and densely populated urban area; may include several independent administrative districts