The answer to the crossword is UNION, which is a five-letter word. A UNION is a collection of chapters, which are usually organized by a common purpose or goal. It is a form of organization that allows members to work together to achieve a shared objective. Unions can be found in many different industries, from labor unions to professional associations. They are often used to protect the rights and interests of their members, as well as to promote collective bargaining and other forms of collective action.