The difference between preacher and pastor is that a preacher is someone who spreads the word of God and does not perform any formal duties for the congregation. But a pastor on the other hand is someone who has a more formal role and is said to oversee the congregation and guide it towards salvation.
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.