Center letter: f
Outer letter: g i l n o e
Answers (44):
  lifelong
  elfin
  feel
  feeling
  feign
  feigning
  feline
  fell
  felling
  felon
  fennel
  fief
  fife
  fifing
  file
  filing
  fill
  filling
  fine
  fining
  flee
  fleeing
  fling
  flinging
  floe
  flog
  flogging
  fogging
  foil
  foiling
  folio
  fool
  fooling
  golf
  golfing
  goof
  goofing
  infill
  infilling
  info
  life
  lifeline
  offing
  offline