metropolis vs Allentown

metropolis and Allentown both are nouns.

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

metropolis (noun)	Allentown (noun)
people living in a large densely populated municipality	a city in eastern Pennsylvania; an industrial and commercial center
a large and densely populated urban area; may include several independent administrative districts