Center letter: f
Outer letter: b e i l n o
Answers (30):
  nonbelief
  beef
  befell
  belief
  biff
  boffo
  elfin
  enfeeble
  feeble
  feel
  feline
  fell
  felon
  fennel
  fief
  fife
  file
  fill
  fine
  flee
  floe
  foible
  foil
  folio
  fool
  infill
  info
  life
  lifeline
  offline