Center letter: p
Outer letter: a e h n o y
Answers (42):
  payphone
  apnea
  epee
  happen
  happy
  heap
  hoop
  hope
  hoppy
  hype
  hyphen
  hypo
  nape
  neap
  nope
  open
  paean
  pane
  papa
  papaya
  pappy
  payee
  peahen
  peen
  peep
  penne
  penny
  peon
  peony
  peppy
  phone
  phono
  phony
  phooey
  pone
  pony
  pooh
  poop
  pope
  poppa
  poppy
  yappy