sorter
noun uk/ˈsɔː.tər/ us/ˈsɔːr.t̬ɚ/
mail sorterUS （把信件和包裹分类以便投递的）信件分拣员
someone who puts letters and parcels into groups before they are delivered
grain sorter 谷物分拣机
a machine that separates the wheat or other grains from any waste or unwanted material mixed in with it