The most direct difference between pea flour and pea starch lies in the fact that pea flour is ground from actual peas, while pea starch is starch extracted from the body of the pea. The two items are only one word apart, but can make a world of difference in terms of the nutrition and quality produced. Pea flour is a natural, nutritious crop mill, while pea starch is a real step down. But nowadays pea starch is used as an ingredient in many cuisines, such as cold skin, cold noodles, etc., which also highlights the importance and taste of pea starch. In short, the most direct difference between the two things is that one is extracted, one is its own grinding, the difference between the two is still very obvious.