Ann Arbor vs metropolis

Ann Arbor and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ann Arbor	Yes	No	No	No
metropolis	Yes	No	No	No

Ann Arbor (noun)	metropolis (noun)
a city in southern Michigan near Detroit; site of the University of Michigan	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts