Center letter: i
Outer letter: d m o r t y
Answers (28):
  dormitory
  dimity
  dirt
  dirty
  ditto
  ditty
  droid
  idiom
  idiot
  itty
  midi
  mirror
  mitt
  oddity
  omit
  riot
  roti
  tidy
  timid
  timidity
  tomtit
  tori
  torii
  toroid
  torrid
  torridity
  trim
  trio