Center letter: r
Outer letter: a c d f i t
Answers (55):
  diffract
  acrid
  adrift
  afar
  affair
  afraid
  aircraft
  arcadia
  arctic
  aria
  arid
  artifact
  atria
  attar
  attract
  carat
  card
  cardiac
  cart
  cataract
  circa
  cirri
  citric
  craft
  critic
  dart
  diacritic
  dirt
  draft
  drat
  drift
  fair
  farad
  fart
  frat
  friar
  frittata
  radar
  radii
  raffia
  raft
  raid
  raita
  ratatat
  riff
  riffraff
  rift
  tariff
  tart
  tartar
  tiara
  tract
  traffic
  trait
  triad