San Sebastian vs city

San Sebastian and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
San Sebastian	Yes	No	No	No
city	Yes	No	No	No

San Sebastian (noun)	city (noun)
a city in northern Spain on the Bay of Biscay near the French border; a fashionable seaside resort	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter