General terms:
* Stack
* Pile
* Heap
* Bunch
* Pack
More specific terms:
* Reem: A bundle of 500 sheets of paper.
* Quire: A bundle of 24 sheets of paper.
* Folio: A folded sheet of paper, often used for books.
* Pamphlet: A small booklet of unbound pages.
* Brochure: A booklet with a cover, often used for advertising or information.
Other possibilities:
* Dossier: A collection of documents related to a particular subject.
* Portfolio: A collection of an artist's work.
* Archive: A collection of historical documents.
The best term to use depends on the specific context and the type of paper involved.