A closet organizer is a tool used to help keep closets organized. The most common type of closet organizer is the shoetree, which is an 8-letter word. It is a device that holds multiple pairs of shoes in an upright position, allowing for easy access and organization. Shoetrees are usually made of plastic or metal and come in various sizes to fit different types of closets. They can also be used to store other items such as hats, scarves, and belts.