metropolis vs Brownsville

metropolis and Brownsville both are nouns.

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

metropolis (noun)	Brownsville (noun)
people living in a large densely populated municipality	a city in southern Texas on the Rio Grande near its mouth into the Gulf of Mexico; has a channel that accommodates oceangoing ships
a large and densely populated urban area; may include several independent administrative districts