Center letter: d
Outer letter: a c h i n r
Answers (36):
  arachnid
  acid
  acidic
  acrid
  arcadia
  arcadian
  arid
  canard
  candid
  canid
  card
  cardiac
  chad
  chard
  cicada
  circadian
  dacha
  darn
  dinar
  drain
  hand
  hard
  harridan
  hind
  indica
  indicia
  nada
  nadir
  naiad
  radar
  radian
  radii
  raid
  rancid
  rand
  rind