Center letter: p
Outer letter: g i l n o t
Answers (72):
  piloting
  plotting
  toppling
  gloop
  glop
  glopping
  goop
  lipo
  lipping
  lollipop
  lollop
  lolloping
  loop
  looping
  loping
  lopping
  nipping
  opining
  opinion
  opting
  option
  optioning
  pigging
  piling
  pill
  pilling
  pillion
  pilot
  ping
  pinging
  pining
  pinion
  pinioning
  pinning
  pinot
  pinpoint
  pinpointing
  pint
  pinto
  piping
  pipit
  pippin
  piton
  pitting
  plop
  plopping
  plot
  pogo
  pogoing
  point
  pointing
  poling
  polio
  poll
  polling
  polo
  pong
  pontoon
  pool
  pooling
  poop
  pooping
  poplin
  popping
  potion
  potting
  tipi
  tipping
  tippling
  tiptop
  toping
  topping