The term MANUSCRIPT SENDER can be solved by the 6-letter word AUTHOR. An AUTHOR is a person who creates a written work, such as a book, poem, or article. They are responsible for the content of the work, and often spend a great deal of time researching and writing it. Once the work is complete, the AUTHOR must then send it to a publisher or other recipient. This process is known as manuscript sending, and the person responsible for it is the AUTHOR.