Mary, I'll go out on a limb here (if someone cuts the limb out from under me you'll be the blame

)
IMO a tomboy will wear a dress if forced to, and play the games that normally guys play even if it means injury is imminent. They are tougher than most and probably will not be found behind a desk answering phones for a stuffed shirt corporate executive. Not that there is anything wrong with that of course (dang you've got to cover your #$% nowadays).
Butch, IMO, is being more like a man than most men and is not into mushy stuff like, well ... dating, dancing, watching movies that don't include machine guns and blowing up stuff.
I'll stop now before I start to get hate mail.
Clayton