Center letter: m
Outer letter: b e i n t u
Answers (38):
  bitumen
  benumb
  biennium
  eminent
  emit
  imbibe
  imbue
  imminent
  immune
  item
  meet
  meme
  mentee
  menu
  mete
  mien
  mime
  mine
  mini
  minim
  minimum
  mint
  minuet
  minute
  minutemen
  mite
  mitt
  mitten
  mute
  mutt
  muumuu
  nimbi
  numb
  teem
  tenement
  time
  unmet
  unmute