metropolis vs Waco

metropolis and Waco both are nouns.

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

metropolis (noun)	Waco (noun)
people living in a large densely populated municipality	a city in east central Texas
a large and densely populated urban area; may include several independent administrative districts