Cape Town vs city

Cape Town and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
Cape Town	Yes	No	No	No
city	Yes	No	No	No

Cape Town (noun)	city (noun)
port city in southwestern South Africa; the seat of the legislative branch of the government of South Africa	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