Center letter: d
Outer letter: a b i l o r
Answers (56):
  billboard
  aboard
  abroad
  adobo
  ardor
  arid
  bald
  ballad
  bard
  billiard
  biradial
  bird
  blood
  board
  bold
  bollard
  brad
  braid
  bridal
  broad
  brood
  dial
  dildo
  dill
  dodo
  doll
  dollar
  dolor
  doodad
  door
  dorado
  drab
  drib
  drill
  droid
  droll
  drool
  idol
  laid
  lard
  libido
  load
  lord
  oddball
  odor
  rabid
  radar
  radial
  radii
  radio
  raid
  railbird
  railroad
  ribald
  road
  rood