Baltimore vs metropolis

Baltimore and metropolis both are nouns.

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

Baltimore (noun)	metropolis (noun)
the largest city in Maryland; a major seaport and industrial center	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts