metropolis vs Buffalo

metropolis and Buffalo both are nouns.

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

metropolis (noun)	Buffalo (noun)
people living in a large densely populated municipality	a city on Lake Erie in western New York (near Niagara Falls)
a large and densely populated urban area; may include several independent administrative districts