metropolis vs New Delhi

metropolis and New Delhi both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
New Delhi	Yes	No	No	No

metropolis (noun)	New Delhi (noun)
people living in a large densely populated municipality	a city in north central India
a large and densely populated urban area; may include several independent administrative districts