Center letter: t
Outer letter: c d i m o y
Answers (23):
  commodity
  city
  comity
  commit
  coot
  dimity
  ditto
  ditty
  dotty
  idiot
  idiotic
  itty
  mitt
  moot
  motto
  oddity
  omit
  tidy
  timid
  timidity
  toddy
  tomtit
  toot