A priest is anyone who is ordained to the priesthood. Ministers are anyone who performs a particular function at Mass, for instance a Extraordinary Minister of the Eucharist is usually a duly ordained acolyte but may (and usually is in the 21st century) a layman or even laywoman).
Who is the leader of the Protestant Church?
Martin Luther, often called the father of Protestantism, fundamentally changed the Christian world through his force of will and new ideas. He tried passionately to reform the Catholic Church.