Center letter: n
Outer letter: a b e f i l
Answers (54):
  ineffable
  infallible
  alien
  alienable
  anal
  annal
  anneal
  baleen
  banal
  banana
  bane
  bean
  beanball
  beanie
  beeline
  been
  befallen
  biennia
  biennial
  blin
  blini
  elan
  elfin
  enable
  enfeeble
  fallen
  feline
  fennel
  final
  finale
  fine
  finial
  flan
  flannel
  inalienable
  inane
  infill
  innie
  lain
  lanai
  lane
  lean
  lien
  lifeline
  line
  lineal
  linen
  naan
  naif
  nail
  nana
  nene
  nibble
  nine