It's not quite clear which word you need.
bookshelf could be just a simple unit of 1/2 shelf/shelves
bookcase is a big unit designed to hold principally books, but may include a small cupboard or drawer or two
stationaey refers to paper and similar items (pens etc) used for paperwork, thus a shelf for a simple unit, or a cupboard for a larger unit.
I'm assuming that you're interested in storing stuff rather than working on it, thus I exclude desk, bureau (=writing table/desk)
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