Center letter: d
Outer letter: a g i l n o
Answers (64):
  diagonal
  loading
  adagio
  adding
  addling
  aiding
  dandling
  dang
  dangling
  dial
  dialing
  dialog
  diddling
  digging
  dildo
  dill
  ding
  dinging
  dingo
  dining
  dino
  dodging
  dodo
  dogging
  doggo
  doing
  doling
  doll
  dolling
  dong
  donning
  doodad
  doodling
  gadding
  gangland
  gild
  gilding
  glad
  gladioli
  gland
  gliding
  goad
  goading
  gold
  gonad
  gondola
  good
  idling
  idol
  indigo
  inlaid
  inland
  lading
  ladling
  laid
  land
  landing
  load
  lodging
  nada
  naiad
  nodal
  nodding
  noodling