Portland vs metropolis

Portland and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Portland	Yes	No	No	No
metropolis	Yes	No	No	No

Portland (noun)	metropolis (noun)
largest city in Maine in the southwestern corner of the state	people living in a large densely populated municipality
freshwater port and largest city in Oregon; located in northwestern Oregon on the Willamette River which divides the city into east and west sections; renowned for its beautiful natural setting among the mountains	a large and densely populated urban area; may include several independent administrative districts