Professional organisation refers to a group of professionals working together towards a common goal. However, there are many synonyms for the term "professional organisation" depending on the context and the field of work. For example, in the medical field, such an organisation could be called a medical association, society, or institute. In the legal field, it may be referred to as a bar association or law society. In the business world, it could be known as a trade association or chamber of commerce. These terms reflect the specific industry and the nature of professionals involved but all have one common goal of advancing their respective fields through collective efforts.