We required an exam account with Word 2013 with Spelling Proofing disabled, so I read this thread and it blocked everything as previously stated but the Red squiggly line and the right click spelling suggestions were still in Word.
I then found this, which has got rid of the red squiggly line and the right click suggestions:
For those who may need this in the future under User Configuration>Preferences>Windows Settings you'll find Registry, create a New Registry Item:
Action: Create
Hive: HKEY_CURRENT_USER
Key Path: Software\Microsoft\Shared Tools\Proofing Tools\1.0\Office
Value Name: WordSpellingOptions
Value Type: REG_DWORD
Value Data: 0
Hope this helps
