metropolis vs Thessaloniki

metropolis and Thessaloniki both are nouns.

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

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