A member of the chief order of prelates attached to the papal Curia. there are four types: 1. Those who sign papal documents, act in connection with the consistories and processes of canonization, examine candidates, and confer certain ecclesiastical degrees; 2. certain canons of St. Peter's, the Lateran, St. Mary Major, and a number of cathedral chapters outside of Rome; 3. those entitled to the same external insignia as the first class above; and 4. priests outside of Rome who receive the dignity.
A dignitary having jurisdiction in external forum by right of his office. There have been prelates "nullius" who presided over the clergy and people of a certain territory not belonging to an established diocese. Thus abbots, although not bishops, have had the jurisdiction of a prelate. Such prelacies have been drastically reduced since the Second Vatican Council. In exempt religious orders, clerical superiors, such as provincials, guardians, and priors, share in the jurisdictional rank of prelate. ***The name and rank of prelate may also be given to priests as a mark of papal recognition of their service to the Church.*** (Etym. Latin praelatus, prelate, superior.) ***this would be your honorary prelate***
A priest who serves a chapel or oratory or is appointed to exercise the sacred ministry in an institution, such as a convent or orphanage, hospital or prison. Also a priest or other sacred minister appointed to serve special classes of persons, such as the armed forces, or authorized to lead religious services in the assemblies of fraternal organizations, legislatures, and other bodies. (Etym. Latin cappellanus; from cappella, shrine.)
***or in your case here, appointed to serve the Pope, ie to preach to him or offer him priestly advice. Usually the Pope's Confessor is a different priest.***
VICAR-GENERAL ( this is the term in our diocese for an episcopal vicar- it's th same thing)
A legitimately deputized assistant to a bishop with ordinary jurisdiction over an entire diocese. His term of office expires with the death, resignation, or transfer of the bishop. Unless the size of a diocese or diversity of rites absolutely requires it, there may be only one vicar-general appointed. He should be an experienced priest of excellent moral character. The vicar-general may also be an auxiliary bishop. In view of its importance the office is regulated by definite legislation in the Church's canon law.
Source- Catholicreference,net....and my own knowledge
I direct religious education at a Catholic parish.