My answer is limited to the application in a contemporary Christian context. Wikipedia actually has pretty good information about this. read more
Pastor - in the Catholic/Anglican/Orthodox churches, generally refers to the priest who is the presiding priest of a particular parish (one local church community, as opposed to the Church at-large) sort of like a principal of one school and it is a job title. read more
Pastor The priest who is in charge or a parish, he may have associate pastors - recently ordained priests start as associate pastors. Minister Ordinary ministers are the bishops, priests and deacons who administer the sacraments to the faithful. read more