Center letter: f
Outer letter: a c i l n u
Answers (25):
  fanciful
  alfalfa
  calf
  cliff
  cuff
  facial
  fail
  fall
  fanfic
  faun
  fauna
  faunal
  filial
  fill
  final
  financial
  finial
  flail
  flan
  fluff
  fulfill
  full
  infill
  naif
  uncuff