noun
nuncio
NUN-see-oh/ˈnʌnsiˌoʊ/
A diplomatic representative of the pope to a foreign government.
The nuncio meets with the president on behalf of the pope.

Etymology
The general word for a messenger acquired a specialized role: an envoy who represents the pope, particularly as a permanent diplomatic agent at a national capital.
In context
ambassador for your country, known as the Apostolic Nuncio.
This neutrality was supported by the Vatican and its Nuncio - or Ambassador - in Madrid,
More examples
- The pope appoints a new nuncio to Canada.
- The foreign minister welcomes the nuncio at an official reception.
- Nuncios represent the pope in countries around the world.
Forms
nuncio · nuncios
nunciature noun — The office or residence of a nuncio.
Similar words
- envoy
- A diplomatic representative, not necessarily one appointed by the pope.
- ambassador
- Represents a country abroad, rather than specifically the pope.