What is a seven letter word containing thousands of letters?

after the moon goes from a full moon it turns into a waning gibbous moon.

here's where my answer came from. i hope this .

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.