New Delhi vs metropolis

New Delhi and metropolis both are nouns.

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

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