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The piece of wood supporting a row of books is known as a bookshelf, however, as an individual piece of furniture, the item which stores books (on one or more shelves) is known as a bookcase. "Please place your book back on the bookshelf/in the bookcase when you have finished with it."

A single shelf that you put or store books on is referred to as a 'bookshelf' if you have numerous shelves in a unit this is called a 'bookcase'

Although less common it is still used in many English speaking countries. A rack is another name for a shelf. It is usually a wooden frame that is nailed or stuck to the wall that is used to hold things.

We can keep our books neatly displayed in a bookshelf. Bookshelves are great for keeping your books neatly organized and help store books in a way that makes the books easily accessible.

A bookshelf is used to store books and there are many bookshelves found in libraries. Many people have a bookshelf in their homes too as it it useful to store books and many other items. This is used to keep the books in a neat and orderly condition. Cabinets are also used to store books but they aren't limited to just books. Cabinets can be used to store other items as well such as ornaments. Example: Please return the book to the bookshelf in the study hall.

In English it is mostly if not completely common to call a shelf that holds books a bookshelf. This special area could be called your "reading nook", although a nook is more the place you sit to read including atmosphere. Library is the common word for many shelves that hold books. Library could be used for bookshelves in a home if the shelves cover a wall or more.

"Bookshelf" is often the term used when talking about a shelf that will be used to hold books, "Bookcase" Is often the term describing a cabinet or case rather than a shelf.