Center letter: r
Outer letter: a c d i m t
Answers (48):
  dramatic
  acrid
  arcadia
  arctic
  aria
  arid
  armada
  atria
  attar
  attract
  carat
  card
  cardiac
  cart
  cataract
  circa
  cirri
  citric
  cram
  critic
  dart
  diacritic
  dirt
  dram
  drama
  drat
  maraca
  marm
  mart
  midair
  radar
  radii
  raid
  raita
  ramada
  ratatat
  tamari
  tarmac
  tarmacadam
  tart
  tartar
  tiara
  tract
  trait
  tram
  tramcar
  triad
  trim