Processing cotton is a labor-intensive job that requires several steps. The first step is ginning, which is the process of separating the cotton fibers from the seeds. This is done with a machine called a GIN, which is short for cotton GIN. The GIN has four letters, so the crossword solution is GINS. The second step is ginning, which is the process of cleaning and straightening the fibers. This is done with a machine called a GIN, which has three letters, so the crossword solution is GIN.