Center letter: f
Outer letter: g i l n o r
Answers (42):
  flooring
  fifing
  filing
  fill
  filling
  fining
  firing
  fling
  flinging
  flog
  flogging
  floor
  fogging
  foil
  foiling
  folio
  fool
  fooling
  forging
  forgo
  forgoing
  forlorn
  frill
  fringing
  frog
  golf
  golfing
  goof
  goofing
  griffin
  griffon
  infill
  infilling
  info
  infringing
  offing
  riff
  riffing
  riffling
  rifling
  roof
  roofing