City of the Angels vs metropolis

City of the Angels and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
City of the Angels	Yes	No	No	No
metropolis	Yes	No	No	No

City of the Angels (noun)	metropolis (noun)
a city in southern California; motion picture capital of the world; most populous city of California and second largest in the United States	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts