When the tab "Word search" is selected then all the words which exist in the selected file group (project) are shown in alphabetical order, where appropriate (only) in the basic form of the word:
If the tab "Category search" is chosen then only those words contained in the current project which belong to the selected category are shown:
In both cases: Each word displayed occurs in at least one file. The inverse is also true: If a word does not appear in the list, then it is not contained in any file of the current project.