it would be like saying congress or the white house is the same as usa, and white house should be an acceptable answer on country quizes..(I am sure there are better examples, but this one does the job). Vatican city is a country (city state) so it is a geographical term. The vatican is like the governing body of the roman catholic church, so nothing geographical, no country.
Also possible answer Dominican Republic (kind of).
It should be on this list.