Center letter: a
Outer letter: d g i n t u
Answers (57):
  auditing
  daunting
  inundating
  adding
  again
  aging
  agita
  agitating
  aiding
  angina
  anti
  attain
  attaining
  attuning
  audit
  aunt
  dang
  data
  dating
  daunt
  gadding
  gaga
  gagging
  gain
  gaining
  gait
  gang
  ganging
  gating
  gauging
  gaunt
  giant
  gnat
  iguana
  indignant
  initiating
  naan
  nada
  nagging
  naiad
  nana
  natant
  tagging
  taiga
  taint
  tainting
  tang
  tannin
  tanning
  tatting
  taunt
  taunting
  taut
  titan
  tuna
  untag
  untagging