Center letter: b
Outer letter: a c e h k l
Answers (39):
  checkable
  hackable
  aback
  able
  baba
  babble
  babe
  babel
  babka
  back
  backache
  bake
  bale
  balk
  ball
  beach
  beak
  beck
  beech
  belch
  bell
  belle
  blab
  black
  blackball
  blah
  bleach
  bleak
  blech
  cabal
  cabala
  cable
  callable
  callback
  celeb
  healable
  kabbalah
  kebab
  label