Center letter: r
Outer letter: a c d i l o
Answers (65):
  cordial
  accord
  acrid
  arcadia
  arco
  ardor
  aria
  arid
  aril
  caloric
  card
  cardiac
  cardio
  cardioid
  carioca
  carload
  carol
  circa
  cirri
  coir
  collar
  collard
  color
  coral
  cord
  corolla
  corral
  corrida
  corridor
  croc
  croci
  dollar
  dolor
  door
  dorado
  drill
  droid
  droll
  drool
  lair
  lard
  liar
  lira
  lord
  odor
  oral
  orca
  racial
  radar
  radial
  radical
  radii
  radio
  raid
  rail
  railcar
  railroad
  rial
  rill
  road
  roar
  rococo
  roil
  roll
  rood