Center letter: i
Outer letter: h l m n o t
Answers (38):
  millionth
  monolith
  hill
  hilt
  hint
  into
  lilt
  limit
  limn
  limo
  lint
  lion
  litho
  loin
  lotion
  mill
  million
  mini
  minim
  minion
  mint
  mitt
  moil
  moonlit
  motion
  ninth
  nonillion
  notion
  olio
  omit
  onion
  thin
  till
  tilt
  tilth
  tint
  toil
  tomtit