A script writer is a person who creates written works for the purpose of film, television, or theater. They are responsible for creating the dialogue and story lines for these productions. The term 'script writer' can be broken down into two words: 'PEN' and 'DOC'. 'PEN' is a three letter word that refers to the writing instrument used by script writers to create their works. 'DOC' is also a three letter word which stands for document, referring to the written works created by the script writer.