When you choose the Add to Dictionary command in Word 2013, the given word is placed into the custom dictionary. Recognizing that people may change their minds, Word allows you to edit its custom dictionary, to remove words you may have added accidentally.
To remove unwanted words from the custom dictionary, follow these steps: ... http://www.dummies.com/how-to/content/how-to-remove-words-from-the-word-2013-custom-dict.html