What are the key differences between bourbon and bourbon whiskey?

Bourbon and bourbon whiskey are essentially the same thing. Bourbon is a type of whiskey that is made primarily from corn and aged in new charred oak barrels. The term "bourbon whiskey" is often used to specifically refer to this type of whiskey made in the United States, particularly in Kentucky. So, in short, bourbon and bourbon whiskey are interchangeable terms for the same type of whiskey.