subcollection

/ˌsʌbkəˈlɛkʃən/
noun
  1. A smaller group or set of items that is part of a larger collection.
    • The app lets you create a subcollection of your favorite songs from your main playlist.
    • The library has a subcollection of rare books from the 18th century.
    • In the museum, the dinosaur fossils form a subcollection within the paleontology exhibit.
What does "subcollection" mean? | whatsthatwordmean | whatsthatwordmean