Canton vs metropolis

Canton and metropolis both are nouns.

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

Canton (noun)	metropolis (noun)
a city on the Zhu Jiang delta in southern China; the capital of Guangdong province and a major deep-water port	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts