The term 'Study of Human Behaviour' can be summarized as Sociology, which is a 9-letter word. Sociology is the scientific study of social behavior and its origins, development, organizations, and institutions. It is a social science that uses various methods of empirical investigation and critical analysis to develop a body of knowledge about social order, acceptance, and change. It is a broad field of study that examines how people interact with each other and how these interactions shape societies and cultures.