metropolis vs Taichung

metropolis and Taichung both are nouns.

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

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