Center letter: d
Outer letter: a i l m n o
Answers (44):
  mandolin
  adman
  admin
  almond
  amid
  damn
  dial
  diamond
  dildo
  dill
  dino
  dodo
  doll
  dolma
  domain
  dominion
  domino
  doodad
  doom
  idiom
  idol
  inlaid
  inland
  laid
  land
  load
  madam
  madman
  maid
  mainland
  mandala
  midi
  midland
  mild
  mind
  modal
  mold
  monad
  mondo
  mood
  nada
  naiad
  nodal
  nomad