Center letter: o
Outer letter: e f i l n x
Answers (27):
  flexion
  felon
  floe
  foil
  folio
  fool
  info
  leonine
  lion
  loin
  loll
  lone
  loon
  loonie
  neon
  noel
  none
  nonillion
  noon
  offline
  oleo
  olio
  ollie
  onion
  online
  oxen
  xenon