Are Bullies Bitches?

We recently did a show about the word bitch which was eye opening in many ways.  We explored the sexual bias and implications and also why it is destructive for a productive society.  In doing research for this show I revisit many of the same feelings I had during that shows production.  I am baffled and at times enraged at the personal pain one feels when faced with encountering a bitch or a bully.  When revisiting the scenarios of bitch victims I think about that unfortunate girl who is isolated and attacked (mostly verbally) by a group of peer bitches.  Smiting her clothes, endagering her self esteem and focussing on making her life a living hell.  Cut to a bully, which isolates it's prey, assaulting them with words but more likely physical force and demading defeat.  It may just be the way my mind works but when I think of a bitch I still think of a female predator and when I think of a bully I instantly imagine a male.  Which leads me to ponder, are bitches and bullies the same thing, just gender specific terms?!  What do you think?!?!