A preacher, minister, or pastor is a Christian clergyman who preaches either regularly or occasionally in the pulpits of a church. They are usually considered among the most using on their religion and represent Christianity to its congregation… The word for priest in Greek is presbyter and means elder.

In other words, priests are called “presbyters,” which can also be translated as “elders.” Pastors are also elders in the faith but they primarily focus on preaching from sermons. Bishops serve both roles. Priests need not preach sermons although many do; while pastors have a set requirement to preach.
Priests traditionally wear special clothes that denote their involvement with mass rituals.