Santa Maria de Belem vs metropolis

Santa Maria de Belem and metropolis both are nouns.

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

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