Center letter: f
Outer letter: a g i l n u
Answers (48):
  gainful
  unfailing
  unflagging
  alfalfa
  fail
  failing
  fall
  falling
  fang
  fanning
  faun
  fauna
  faunal
  fifing
  filial
  filing
  fill
  filling
  finagling
  final
  finial
  fining
  flag
  flagging
  flail
  flailing
  flan
  flanging
  fling
  flinging
  fluff
  fluffing
  flung
  fugu
  fulfill
  fulfilling
  full
  fungal
  fungi
  gaff
  guff
  gulf
  infill
  infilling
  luff
  lungful
  naif
  unfulfilling