The term 'Forbidden Practice' can be summarized by two crossword solutions: 'TABOO' (5 letters) and 'Nono' (4 letters). TABOO is a term used to describe an action or behavior that is socially unacceptable or forbidden. It is often associated with religious or cultural beliefs and practices. Nono is a term used to describe something that is not allowed or prohibited. It is often used to refer to something that is illegal or morally wrong.