metropolis vs Springfield

metropolis and Springfield both are nouns.

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

metropolis (noun)	Springfield (noun)
people living in a large densely populated municipality	capital of the state of Illinois
a large and densely populated urban area; may include several independent administrative districts	a city and manufacturing center in southwestern Massachusetts on the Connecticut River
	a city of southwestern Missouri