Center letter: d
Outer letter: g i l n o p
Answers (43):
  dolloping
  plodding
  diddling
  digging
  dildo
  dill
  ding
  dinging
  dingo
  dining
  dino
  diploid
  dipping
  dodging
  dodo
  dogging
  doggo
  doing
  doling
  doll
  dolling
  dollop
  dong
  donning
  doodling
  doping
  gild
  gilding
  gliding
  gold
  good
  idling
  idol
  indigo
  lipid
  lodging
  nodding
  noodling
  opioid
  piddling
  pidgin
  plod
  pond