I just want to know what kind of words children should use when they see a fight going on in the school in order to stop the fight or to make the students come down, instead of aggravation the situation?

i think what themaa was trying to say was "there aren't any"
apart from going to the teacher and saying what's happening, i don't think other children could stop it.
unless of course they happen to be more powerful, in some way, than the ones who are fighting.
the pen may be mightier than the sword but not in the playground.