The title, "The Roman Catholic Church" is the proper name for the supernatural institution founded by Jesus Christ as a vehicle of grace, teaching and ultimately salvation for the souls of mankind. It is also called "The Catholic Church" or "The Christian Church" or simply "The Church" and is the largest and oldest of any organized religion that refers to itself as Christian.
Addendum:
The term Roman Catholic was actually a derogatory term used primarily by Anglicans to distinguish 'their' so called Catholic Church from the Catholic Church that was united under the Pope in Rome.
Pope John XXIII called for Vatican 2.
The Vatican.
The Church is called Saint Peters Basillica.
The worldwide headquarters of the Catholic Church is the Vatican in Rome and is headed by the Pope. The 'headquarters' are in the Vatican city. This is inside Rome but it has its own government so it is not actually part of Rome.
Vatican City is the seat of government of the Catholic Church.
Yes, the Catholic Church is the only church in the Vatican.
Vatican is the name of an independent country, not of a church.
Pope John XXIII called the council.
No, the Vatican is the home of the Pope, who is head of the Catholic Church.
Ther Vatican is a country, not a church.
The Vatican is owned by the Catholic Church.
Vatican City is the home of the Pope. His home is close to St. Peter's Basilica, the largest church in the Vatican City.