See http://strayrobotgames.com/wooords/
$ ./wooords.py <mandatory letter> <others>
For example:
$ ./wooords.py s aaceiprs
aces
acres
airs
...
spirea
spireas
spires
sris
Found 242 words
Bingos: airspaces
BTW, there are about 16,000 nine-letter bingo words in this dictionary!