Both WProofreader and SCAYT plugin for CKEditor version 4.7.0+ has separate user interface features for advanced personal dictionary management. Using this interface you can add or delete words from the dictionary. 

You cannot edit the words added to a personal user dictionary. If you want to modify a word, you need to delete a word first and then add it again.

Deleting a word in dictionary in WProofreader

To delete a word from a personal dictionary: 

  1. Start WProofreader in your web app.
  2. Navigate to the Go to Dictionary tab of the Settings dialog. 
  3. Connect the desired dictionary or view the words of the currently used dictionary located under the Enter new word area. 
  4. Navigate to the list of words in the lower part of the screen and clickicon near the word you want to delete.

Deleting a word in SCAYT plugin for CKEditor 4

To delete a word from a personal dictionary: 

  1. Click the ABC  icon and select Dictionaries from the drop-down list. 
  2. In the Dictionaries tab that opens, navigate to the desired word in the lower part of the screen and click   icon near it. 

If you need to delete a word from a dictionary other than selected one, follow the procedure of connecting a dictionary described in Where can I see a full list of words added to the dictionary? section.

Also, you can use the deleteword Web API action for the user_dictionary Web API command to receive the list of the words from the exact dictionary using its name. This approach is more likely can be suitable for the software admin.