Center letter: p
Outer letter: a g h i n r
Answers (41):
  graphing
  harping
  paragraphing
  apian
  aping
  gaping
  graph
  grappa
  grip
  griping
  gripping
  hairpin
  harp
  napping
  nipping
  pagan
  paging
  pain
  paining
  pair
  pairing
  pang
  panini
  panning
  papa
  paragraph
  pariah
  paring
  pigging
  ping
  pinging
  pining
  pinning
  piping
  pippin
  piranha
  prig
  rapini
  rapping
  riparian
  ripping