This is a PPWIZARD command line switch.
This option can be specified if you have used /SpellCheck (use empty dictionary if required) to enable spell checking.
What it allows you to do is indicate which incorrect words should be added to a dictionary file. All words you wish to add are added to the file sorted in order of the number of occurances of this word so that the most frequently used (therefore most important) are first.
You would typically manually cut and paste words from the generated file to one of your dictionary files.
To automatically add all words to the file preceed the filename with "-".