Reverend generally is a broader term for a person in the ministry while pastor denotes a more specific role. A Reverend is a Priest who may or may not lead a Parish as a Pastor. He may have a title of Associate Pastor or Priest. So a Pastor can also be called Reverend.
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.