Center letter: c
Outer letter: a e f l t u
Answers (50):
  effectual
  fluctuate
  acetal
  acetate
  actual
  actuate
  acute
  affect
  cafe
  calculate
  calf
  call
  calla
  catcall
  cattle
  caul
  cell
  cellule
  cleat
  clef
  cleft
  clue
  cuff
  cull
  cult
  cute
  cutlet
  cuttle
  eclat
  efface
  effect
  effectuate
  elect
  electee
  face
  facet
  fact
  factual
  faucet
  fecal
  fleece
  lace
  lactate
  lacteal
  lettuce
  tacet
  tact
  tactful
  tactual
  talc