The term 'No Purebred' refers to a type of animal that is not a purebred, or a breed that has been bred for a specific purpose. The three words that can be used to describe this type of animal are MUTT (4 letters), CUR (3 letters), and Mongrel (7 letters). A MUTT is a dog that is not of any particular breed, while a CUR is an old-fashioned term for a mixed-breed dog. A Mongrel is a term for any animal that is not of a purebred variety. All three terms refer to animals that are not purebreds.