Sidon vs metropolis

Sidon and metropolis both are nouns.

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

Sidon (noun)	metropolis (noun)
the main city of ancient Phoenicia	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts