Center letter: p
Outer letter: a d g n o r
Answers (30):
  grandpop
  propaganda
  apron
  dognap
  droop
  drop
  goop
  gorp
  grandpa
  grandpapa
  grappa
  pagan
  pagoda
  panda
  pang
  papa
  paradrop
  paragon
  pardon
  pogo
  pond
  pong
  poop
  poor
  poppa
  porn
  porno
  prod
  prong
  prop