Word 2011 has significantly improved collaboration tools, making it obvious that Microsoft now considers Word for Mac, and thereby the Mac itself, to be an enterprise-level work tool. Word for Mac 2011 helps you structure your ideas, market your business, and create everything from a murder mystery to a holiday newsletter, with style.
Have you for some reason moved the Word application of the Office2011 Directory in the Applications directory?
Try looking for the word application. when you find it, look to see where located. If its anywhere other than the Office2011 Directory Move it Back.
If it is in the Office2011 Directory Try opening directly. IF it works then you need to repair the alias in the Dock.
quit Word. If word is in the office 2011 directory, click on the word icon and Drag to the dock move it down into the dock until the icons on each side appear to move apart when they do release mouse button or trackpad button. Should stay there The other item with the ? mark in the Dock should be removed just drag out of dock on to desktop it will appear to dissolve in a cloud of smoke.
If you can't find word anywhere its possible you threw it in trash and emptied. If so you will have to through: