Something is a bribe if it is given PRIOR to the desired action... basically, if I gave the Princess a piece of candy to get her to be quiet, that would be a bribe. Something is a reward if it is given AFTER the desired behavior. Therefore, telling the Pirate that she could have a snake for a pet if she would let the nice dentist give her two MORE novocaine shots without kicking him and then let him extract two of her remaining baby teeth, that is a REWARD. Somehow I don't think I am going to get the Mommy of the Year Award for this... I think I am going to call the snake "Toothless," no matter what she names it.
On the other hand, she will now have to do her chores, in order to earn the money to buy the crickets and pinks for the snake to eat. There is a cool economics lesson in there... somewhere. I'm going to go beat my head against a wall now.