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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.
Straight bourbon whiskey is a type of whiskey (of course). Whiskey is a type of alcoholic drink made from cereal grains, distilled to strong spirit strength, and usually aged in barrels. Bourbon is a very specific type of whiskey. It must be made in the US. The grain used must be at least 51% corn (maize).