metropolis vs municipality

metropolis and municipality both are nouns.

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

As nouns, municipality is a hypernym of metropolis; that is, municipality is a word with a broader meaning than metropolis:

As nouns, municipality is a hypernym of metropolis; that is, municipality is a word with a broader meaning than metropolis:

metropolis: a large and densely populated urban area; may include several independent administrative districts
municipality: an urban district having corporate status and powers of self-government

metropolis (noun)	municipality (noun)
people living in a large densely populated municipality	people living in a town or city having local self-government
a large and densely populated urban area; may include several independent administrative districts	an urban district having corporate status and powers of self-government