The term 'SERVE SOUP' can be solved by two crossword solutions: LADE (4 letters) and LADLE (5 letters). A LADE is a tool used to scoop up liquid, such as soup, from a container. It is usually made of metal or plastic and has a long handle with a shallow bowl at the end. A LADLE is similar to a LADE, but it has a deeper bowl and is often used for serving soup. Both tools are commonly used in kitchens to serve soup.