The blurb on this book / disk package reads, Supplies you with 470,000 true synonyms for 40,000 entries. My guess is that such a quantity might be reached if one counted all the permutations and combinations; in reality, though, there are probably far fewer actual words.
My guess is the book/disk package's claim of "470,000 true synonyms for 40,000 entries" is probably far fewer in reality.