metropolis vs Santa Maria de Belem

metropolis and Santa Maria de Belem both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Santa Maria de Belem	Yes	No	No	No

metropolis (noun)	Santa Maria de Belem (noun)
people living in a large densely populated municipality	port city in northern Brazil in the Amazon delta; main port and commercial center for the Amazon River basin
a large and densely populated urban area; may include several independent administrative districts