Cornstarch and corn flour show some differences between them. Cornstarch is made from the endosperm of the corn. This is due to the fact that starch constitutes the endosperm of the corn. On the other hand, corn flour is made out of the mixing of endosperm with corn gluten. It is important to know that bran constitutes what is called corn gluten. This is the main difference between cornstarch and corn flour. It is interesting to note that cornstarch is used as a thickener.