Yes. Indeed, millet flour and sorghum flour are not the same. The main difference is that millet refers to the grains derived from the panicum plant.  On the other hand, sorghum refers to the grains derived from the sorghum bicolor. But the same thing about both of them is that they are cereal grains. In addition, both of these grains are gluten-free and very popular in warmer areas of the world.