Center letter: f
Outer letter: d g i n o u
Answers (25):
  founding
  doff
  doffing
  duff
  duffing
  fifing
  find
  finding
  fining
  fogging
  fond
  food
  found
  fudging
  fugu
  fund
  funding
  fungi
  fungo
  goof
  goofing
  guff
  info
  offing
  unfound