1) Mailsorter 1) PO clerk 2) Certain postal worker 3) Classifier 4) Clerk 5) Copier adjunct 6) Copier attachment 7) Copier part 8) Indoor transportation system 9) Mail separator 10) Mail worker 11) Mailroom employee 12) Mailroom worker 13) Many a laundromat patron 14) Office copier part 15) One concerned with classes 
• (n.) One who, or that which, sorts.
Sort'er noun One who, or that which, sorts. 
[n] - a clerk who sorts things (as letters at the post office) 2. [n] - a machine for sorting things (such as punched cards or letters) into classes
noun a machine for sorting things (such as punched cards or letters) into classes