Barcelona vs metropolis

Barcelona and metropolis both are nouns.

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

Barcelona (noun)	metropolis (noun)
a city in northeastern Spain on the Mediterranean; 2nd largest Spanish city and the largest port and commercial center; has been a center for radical political beliefs	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts