Which version of Word are you using? If this is Word 2007, the "toolbar" is
called the ribbon. You can double-click any text command (Home, Insert, Page
Layout, etc.) to minimize the ribbon. A "full" list of commands will be
available after clicking Home, for example; it will hide when clicking in
the document.
In Word 97-2003, you can right-click any toolbar and, on the context menu,
click to hide the ones that you don't want to see.