And I want to add: If you are working in a long, threaded text with long paragraphs that is going from page to page, correcting one occassion of a stacked word can lead to unstacking of other found incidents or can lead to more stacked words on other places. This is depending on what you will do after finding one stack. If you can manage to correct one problem without adding or removing a line of text, you should be fine. Provided you are using the single-line paragraph composer. If not, be prepared that the situation will change above and below the found word stack inside one single paragraph.
Stacked words are a moving target.
Not to mention letters stacked.
Uwe