Center letter: b
Outer letter: c k l o r a
Answers (48):
  rollback
  aback
  arbor
  baba
  babka
  back
  balk
  ball
  ballcock
  baobab
  barb
  barback
  barbacoa
  bark
  barrack
  blab
  black
  blackball
  blob
  bloc
  block
  boar
  boba
  bock
  bola
  boll
  bolo
  boob
  booboo
  book
  bookrack
  boor
  brook
  cabal
  cabala
  callback
  carb
  carob
  cobra
  collab
  cookbook
  crab
  kabob
  labor
  lobo
  lookbook
  robocall
  rollbar