The young priest assigned to a parish to help the pastor is called a curate. The young men who assist the priest at the altar are called altar boys, or sometimes altar servers if the priest in question insists on letting girls help.
The priest's name is Friar Lawrence. He doesn't have an assistant.
This person is called a curate. The duties of a curate are called a 'curacy'. The term 'curate' means "cure of souls". The curate is assigned to a parish as assistant to the parish priest. There may be one or more curates under each priest.
One who aids another; an assistant; a coworker., The assistant of a bishop or of a priest holding a benefice.
Aaron
coadjutor means assistant to the parish priest
Quite simply, he is called a priest.
The Parish Priest
A parish priest is the main priest in a parish. He is responsible for running the parish, so he may have to deal with more practical things, like doing the accounts for the parish. He will also have his normal duties as a priest. Other priests in the parish may help him and they are called curates.
A ruling priest is called a Theocrat
the priest is called a father
They are usually deacons. The children who assist are called altar severs.
When a priest speaks in Church as part of a Liturgy or Service, it is called a Sermon.