subcategory

/ˌsʌbˈkætəɡɔri/
noun
  1. A smaller, more specific group within a larger category.
    • In the store, 'fiction' is a main category, and 'mystery novels' are a subcategory.
    • On the website, you can click on a subcategory to find more specific products.
    • The report broke down expenses into subcategories like food, housing, and transportation.