Center letter: i
Outer letter: a g h l n u
Answers (60):
  hauling
  laughing
  again
  aging
  ailing
  align
  aligning
  angina
  angling
  annuli
  annulling
  gagging
  gain
  gaining
  galling
  ganging
  ganglia
  gangling
  gauging
  gigging
  giggling
  gill
  gilling
  ginning
  glia
  glugging
  gluing
  gulling
  gunning
  haggling
  hail
  hailing
  hanging
  hangnail
  high
  hill
  hilling
  hinging
  hugging
  hulling
  iguana
  inhaling
  inning
  lagging
  lain
  lanai
  linguini
  lining
  lugging
  luging
  lulling
  lunging
  nagging
  nail
  nailing
  niggling
  nigh
  unhanging
  unhinging
  unilingual