The Personalist Project

Nonviolent resistance is not another term for pacifism

At least not pacifism as it is generally understood as opposition to violence of any kind, including self-defense, no matter what.

The theory of nonviolent resistance developed, preached and lived by Martin Luther King, Jr., is much greater and deeper than that. 

Pacifism offers no answer to the problem of aggression; nonviolent resistance does. It is a practical program for the elimination of social evil. Pacifism stands down; nonviolent resistance stands up. 

Pacifiism rejects all violence, without regard to the question of justice. Nonviolent resistance is a method for overcoming injustice for the sake of establishing a just order.

Here are some good links for more:

The Power of Non-Violence

I have a dream

Pilgrimage to Nonviolence

Vaclav Havel's The Power of the Powerless