Center letter: c
Outer letter: a f i l o r
Answers (55):
  calorific
  acacia
  acai
  arco
  cacao
  calf
  calico
  call
  calla
  callaloo
  caloric
  carol
  ciao
  cilia
  circa
  cirri
  cliff
  cloaca
  coal
  coca
  cocci
  cocoa
  coif
  coil
  coir
  cola
  colic
  collar
  color
  colorific
  cool
  coral
  corolla
  corral
  croc
  croci
  facial
  farcical
  focaccia
  focal
  foci
  folic
  frolic
  iliac
  laic
  laical
  lilac
  local
  loci
  loco
  official
  orca
  racial
  railcar
  rococo