subcategories

/sʌbˈkætəˌɡɔriz/
noun
  1. Smaller groups or classes that a larger category is divided into.
    • The store's clothing section has subcategories for men, women, and children.
    • In biology, mammals are a subcategory of vertebrates.
    • The website organizes books into subcategories like fiction, non-fiction, and poetry.