metropolis vs Christchurch

metropolis and Christchurch both are nouns.

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

metropolis (noun)	Christchurch (noun)
people living in a large densely populated municipality	industrial city at the center of a rich agricultural region
a large and densely populated urban area; may include several independent administrative districts