city vs Brownsville

city and Brownsville both are nouns.

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

city (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
an incorporated administrative district established by state charter