Center letter: o
Outer letter: a b d i l r
Answers (59):
  billboard
  aboard
  aboil
  abroad
  adobo
  aioli
  arbor
  arborio
  ardor
  baobab
  barrio
  blob
  blood
  boar
  board
  boba
  boil
  bola
  bold
  boll
  bollard
  bolo
  boob
  booboo
  boor
  brio
  broad
  broil
  brood
  dildo
  dodo
  doll
  dollar
  dolor
  doodad
  door
  dorado
  droid
  droll
  drool
  idol
  labor
  libido
  load
  lobo
  loll
  lord
  oddball
  odor
  olio
  oral
  radio
  railroad
  road
  roar
  roil
  roll
  rollbar
  rood