The term 'MAIN PARTS' can be broken down into two crossword solutions: LEADS (5 letters) and BODIES (6 letters). LEADS typically refer to the main characters in a story, play, or movie, while BODIES are the physical forms of living organisms. In literature, the lead characters are usually the protagonists, or the characters that the audience is meant to root for. In biology, the body is the physical structure of an organism, composed of organs, tissues, and cells.