The term 'working person' can be defined as an OPERATIVE, which is a nine-letter word. An OPERATIVE is someone who works in a professional capacity, usually in a specialized field. They are often employed by a company or organization to carry out specific tasks or duties. Operatives may also be self-employed, working independently on projects or assignments. They typically have a high level of expertise in their chosen field and are expected to use their knowledge and skills to complete their work.