Center letter: n
Outer letter: c d i m o u
Answers (38):
  condominium
  cocoon
  codon
  coin
  common
  communion
  condo
  condom
  conic
  cumin
  dino
  dominion
  domino
  dunno
  icon
  iconic
  indium
  ionic
  mind
  mini
  minim
  minimum
  minion
  mondo
  mono
  moon
  mound
  noncom
  nonunion
  noon
  noun
  nuncio
  onion
  udon
  uncommon
  undid
  undo
  union