Center letter: f
Outer letter: c g i n o r
Answers (27):
  forcing
  coffin
  coffining
  coif
  coiffing
  confining
  fifing
  fining
  firing
  foci
  fogging
  forging
  forgo
  forgoing
  fringing
  frog
  goof
  goofing
  griffin
  griffon
  info
  infringing
  offing
  riff
  riffing
  roof
  roofing