Sub-classes can also be referred to as subtypes, subclasses, categories, subgroups, sub-sets, subcategories, divisions, and subclasses. These terms are used to organize and classify different groups or types within a larger category. For example, in computer programming, sub-classes or subtypes are used to inherit properties and behaviors of a parent class, while adding or modifying specific functionality. In education, the term sub-categories or divisions are used to classify students based on their academic performance or socio-economic status. Similarly, in biology, subgroups or sub-sets are used to categorize different species or organisms within a certain family or genus. Overall, synonyms for sub-classes are useful in providing a clearer and more precise way of communicating about different subsets within a broader category.