Reading vs metropolis

Reading and metropolis both are nouns.

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

Reading (noun)	metropolis (noun)
a city on the River Thames in Berkshire in southern England	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts