metropolis vs Sidon

metropolis and Sidon both are nouns.

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

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