metropolis vs Santa Cruz de la Sierra

metropolis and Santa Cruz de la Sierra both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Santa Cruz de la Sierra	Yes	No	No	No

metropolis (noun)	Santa Cruz de la Sierra (noun)
people living in a large densely populated municipality	a city in central Bolivia
a large and densely populated urban area; may include several independent administrative districts