metropolis vs San Pedro Sula

metropolis and San Pedro Sula both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
San Pedro Sula	Yes	No	No	No

metropolis (noun)	San Pedro Sula (noun)
people living in a large densely populated municipality	industrial city in northwestern Honduras
a large and densely populated urban area; may include several independent administrative districts