Pieces of work are activities or tasks that require effort and time to complete. The term can refer to a variety of different types of work, such as ergs (4 letters), tasks (5 letters) and opuses (6 letters). Ergs are small, specific tasks that are usually part of a larger project. Tasks are more general activities that need to be completed in order to achieve a goal. Opuses are large, complex works that require a great deal of effort and time to complete.