This dialog displays a list of word shortcuts for Magic™. It is initially populated with common words, but is expanded to include words that you enter and search on. Select an entry, tap OK, and it will be copied on the end of the text words field in the Search Words window. Or, tap 'Add', and the currently selected word entry will be added, but this dialog will stay visible, allowing you to enter many words at once. 50 words are kept, with the least used terms removed first.
NOTE: The search words you enter are only added to the word list once you execute a word-based search.