Societal levels refer to the hierarchical structure of a society, which is typically divided into different classes or groups. Caste (6 letters) is a term used to describe a rigid social hierarchy based on birth, wealth, and occupation. STRATA (6 letters) is a term used to describe a more flexible social hierarchy based on education, income, and occupation. Both terms are used to describe the various levels of a society and how individuals are placed within it.