Center letter: a
Outer letter: b c d i l o
Answers (54):
  diabolic
  diabolical
  abaci
  aboil
  acacia
  acai
  acid
  acidic
  adobo
  aioli
  alibi
  baba
  bacilli
  bail
  bald
  ball
  ballad
  baobab
  biblical
  bilabial
  blab
  boba
  bola
  cabal
  cabala
  cacao
  calico
  call
  calla
  callaloo
  ciao
  cicada
  cilia
  clad
  cloaca
  coal
  coca
  cocoa
  coda
  cola
  collab
  diabolo
  dial
  doodad
  iliac
  labia
  labial
  laic
  laical
  laid
  lilac
  load
  local
  oddball