metropolis vs Santiago de los Caballeros

metropolis and Santiago de los Caballeros both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Santiago de los Caballeros	Yes	No	No	No

metropolis (noun)	Santiago de los Caballeros (noun)
people living in a large densely populated municipality	city in the northern Dominican Republic
a large and densely populated urban area; may include several independent administrative districts