metropolis vs Ho Chi Minh City

metropolis and Ho Chi Minh City both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Ho Chi Minh City	Yes	No	No	No

metropolis (noun)	Ho Chi Minh City (noun)
people living in a large densely populated municipality	a city in South Vietnam; formerly (as Saigon) it was the capital of French Indochina
a large and densely populated urban area; may include several independent administrative districts