Pacifist
Part of speech: noun
Definition: One who loves, supports, or favours peace; one who is pro-peace. One who avoids violence. One who opposes violence and is anti-war.
Example sentence: My father, who had lost a brother, fighting on the Austrian side in World War I, was a committed pacifist.
Pacifistic
Part of speech: adjective
Definition: Of or pertaining to pacifism.