Thessaloniki vs metropolis

Thessaloniki and metropolis both are nouns.

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

Thessaloniki (noun)	metropolis (noun)
a port city in northeastern Greece on an inlet of the Aegean Sea; second largest city of Greece	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts