Access can launch Word and probably, with a lot of effort, could make the Word window fit into an otherwise blank space on a form. You would have to look up topics for "Using VBA to resize windows" - which will tell you to make a few references to USER32LIB.DLL or something similar.
The trick will be to identify the window handle for the Word app, which will be available from the Word App object as one of its properties, .hWnd (a 16-bit or WORD integer as opposed to LONG). Once you have the app window handle, the window sizing routines will let you control things including moving the window to the front (also sometimes called Bring to Top). The window sizing and placement routines are available using the great Google brain. I would look them up for you but I'm on a one-lung computer right now. My grandson is playing games on the system I normally use.