The term Holy See also means the Pope and the Roman Curia, the central government of the Roman Catholic Church.

There is no "Roman" Catholic Church: Roman is an epithet first commonly used in England after the protestant revolt to describe the Catholic Church. It is rarely used by the Catholic Church. The Chaldean Catholic Church is part of the Catholic Church.

The Roman Catholic Church is a type of Christian Church.

You would use the phrase Roman Catholic Church as a noun, because it's a name. For example, "The Roman Catholic Church is headquarted in Vatacin City" or "John is a member of the Roman Catholic Church". Tip: there is no Roman Catholic Church. It is the Catholic Church.

Ludwig Vones has written:

'Urban V. (1362-1370' -- subject(s): Catholic Church, Catholic Church. Collegium Cardinalium, Catholic Church. Curia Romana, Church renewal, History, Papacy