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The typical grain mixture for bourbon, known as the mash bill, is a minimum of 51% corn, with the remainder being rye, wheat, malted barley, or some combination of these. A mash bill that contains wheat instead of rye produces what is known as a wheated bourbon. The grain is ground and mixed with water.
In reality, the main difference surrounds the question of what they're made of: whiskeys are made from a fermented mash of grain (usually corn, rye, barley or wheat) whereas bourbon has to be comprised of at least 51% corn as part of its grain mash.