Hamburg vs metropolis

Hamburg and metropolis both are nouns.

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

Hamburg (noun)	metropolis (noun)
a port city in northern Germany on the Elbe River that was founded by Charlemagne in the 9th century and is today the largest port in Germany; in 1241 it formed an alliance with Lubeck that became the basis for the Hanseatic League	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts