Center letter: a
Outer letter: d g i j n u
Answers (25):
  adjudging
  adding
  again
  aging
  aiding
  angina
  dang
  gadding
  gaga
  gagging
  gain
  gaining
  gang
  ganging
  ganja
  gauging
  iguana
  jading
  jagging
  naan
  nada
  nagging
  naiad
  nana
  ninja