Center letter: p
Outer letter: y a e h i n
Answers (38):
  epiphany
  apian
  apnea
  epee
  happen
  happy
  heap
  hippie
  hippy
  hype
  hyphen
  nape
  neap
  ninepin
  nippy
  paean
  pain
  pane
  panini
  papa
  papaya
  pappy
  payee
  peahen
  peen
  peep
  penne
  penny
  peppy
  pine
  piney
  pinny
  pipe
  pippin
  yappy
  yipe
  yippee
  yippie