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: Deleting a word in SCAYT plugin for CKEditor 4 To delete a word from a personal dictionary: 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.