The term 'MAIL WORKER' can be broken down into two words: 'MAIL' and 'WORKER'. The first word, 'MAIL', refers to the postal system and the second word, 'WORKER', refers to someone who is employed in a particular job. One type of MAIL WORKER is a Sorter, which is a six-letter word. A Sorter is responsible for sorting MAIL according to its destination, ensuring that it reaches its intended recipient. They also check for any damaged or missing items and make sure that all packages are properly labeled.