Essay+-+Nigger+and+the+power+of+words

What makes words become 'bombs' ? It's universally acknowledged that words are used to help people to express what they feel. It's much easier for people to live and love with the communication by words. However, why the words can hurt people sometimes?

'Go away' is always top 1 that I want to say when I am angry. I know it hurts, but i just cannot help saying it.