Center letter: u
Outer letter: a d i l p t
Answers (24):
  plaudit
  adult
  applaud
  audit
  dual
  dull
  laud
  luau
  lull
  lulu
  puli
  pull
  pulp
  pulpit
  pupa
  pupal
  pupil
  putt
  taut
  tulip
  tutti
  tutu
  uplit
  uptilt