city vs Ostrava

city and Ostrava both are nouns.

Word	Noun	Adjective	Verb	Adverb
city	Yes	No	No	No
Ostrava	Yes	No	No	No

city (noun)	Ostrava (noun)
people living in a large densely populated municipality	an industrial city in northwestern Czech Republic in the Moravian lowlands; located in the coal mining area of Silesia
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter