Center letter: a
Outer letter: d e h o p t
Answers (58):
  pothead
  adapt
  adapted
  added
  adept
  adopt
  adopted
  adoptee
  ahead
  aped
  atop
  dapped
  data
  date
  dated
  dead
  deadhead
  deadheaded
  death
  doodad
  hate
  hated
  hath
  hatha
  hatted
  head
  headed
  heap
  heaped
  heat
  heated
  heath
  heptad
  hothead
  hotheaded
  oath
  padded
  papa
  pate
  path
  patted
  peapod
  peat
  phat
  poppa
  potato
  tapa
  tape
  taped
  tapped
  tatted
  tattoo
  tattooed
  teapot
  teat
  that
  theta
  toad