city vs Belem

city and Belem both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
Belem	Yes	No	No	No

city (noun)	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
an incorporated administrative district established by state charter