Aberdeen vs metropolis

Aberdeen and metropolis both are nouns.

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

Aberdeen (noun)	metropolis (noun)
a city in northeastern Scotland on the North Sea	people living in a large densely populated municipality
a town in northeastern Maryland	a large and densely populated urban area; may include several independent administrative districts
a town in northeastern South Dakota
a town in western Washington