Center letter: u
Outer letter: a b l m n t
Answers (43):
  ambulant
  abut
  album
  alum
  alumna
  annual
  annul
  aunt
  autumn
  autumnal
  blunt
  bubba
  bulb
  bull
  bunt
  butt
  luau
  lull
  lulu
  luna
  lunula
  manual
  maul
  mull
  mutant
  mutt
  mutual
  muumuu
  null
  numb
  numbat
  tantalum
  taunt
  taut
  tuba
  tubal
  tumult
  tuna
  tutu
  ulna
  umlaut
  unban
  unman