BANQUETTE is a 9 letter word that starts with B.

1. \Ban*quette"\, n. [F. See {Banquet}, n.]
   1. (Fort.) A raised way or foot bank, running along the
      inside of a parapet, on which musketeers stand to fire
      upon the enemy.
   2. (Arch.) A narrow window seat; a raised shelf at the back
      or the top of a buffet or dresser.
   

2. \Ban*quette"\, n.
   A bench or seat for passengers on the top of a diligence or
   other public vehicle.
         My brother-in-law . . . took refuge in the banquette.
                                                  --Mrs. Howe.