How to remove "Start Dictation..." menu item from Word 2011?
The issue is in fact related to the "Start Dictation" menu entry of the 'Edit' menu, which is introduced by the OS wide dictation add-in. 

A suggested workaround is to rearrange the top menu bar: 


  My solution was to disguise the Edit menu. Changing its name did not
  work, but moving it in the menu bar from fourth to fifth position did.
  (For that I used View > Toolbars > Customize Toolbars and Menus.) Now
  Word no longer finds the "Edit" menu, does not mess with it and no
  longer generates garbage logs.


You can read more at Microsoft.