Center letter: a
Outer letter: g h i p r t
Answers (48):
  trigraph
  aargh
  agar
  agita
  airtight
  apart
  apparat
  arhat
  aria
  atria
  attar
  gaga
  gait
  graph
  grappa
  hair
  harp
  hart
  hath
  hatha
  pair
  papa
  paragraph
  paratha
  pariah
  part
  partita
  path
  phat
  pita
  pitapat
  prat
  raga
  ragtag
  raita
  rapt
  ratatat
  rattrap
  taiga
  tapa
  tapir
  tarp
  tart
  tartar
  that
  tiara
  trait
  trap