Would it be possible to see what your print looks like? My initial reaction is to the do word list first and the descriptions second - regardless of how many pages it takes. Maybe include a TN that says that descriptions take __ pages. If you can't do them on facing pages, then you can't. I would not leave a blank left page (if that is the way I am reading your description above) just because the word list doesn't take two pages.
Cindi