Center letter: m
Outer letter: c d i n o u
Answers (29):
  condominium
  comic
  common
  communion
  condom
  cumin
  dominion
  domino
  doom
  dumdum
  idiom
  indium
  midi
  mimic
  mind
  mini
  minim
  minimum
  minion
  modicum
  mondo
  mono
  mood
  moon
  mound
  muumuu
  noncom
  odium
  uncommon