The term PROCESS FLOUR can be summarized by the crossword solution SIFT, which is a four letter word. Sifting is a process used to separate out lumps and debris from flour, making it finer and more uniform in texture. This process is often done with a sieve or sifter, which is a device with a mesh bottom that allows the flour to pass through while trapping any larger particles. Sifting also helps to aerate the flour, making it lighter and fluffier.