Center letter: p
Outer letter: g i l n o w
Answers (52):
  pillowing
  plowing
  gloop
  glop
  glopping
  goop
  lipo
  lipping
  lollipop
  lollop
  lolloping
  loop
  looping
  loping
  lopping
  nipping
  opining
  opinion
  pigging
  piling
  pill
  pilling
  pillion
  pillow
  ping
  pinging
  pining
  pinion
  pinioning
  pinning
  piping
  pippin
  plop
  plopping
  plow
  pogo
  pogoing
  poling
  polio
  poll
  polling
  polliwog
  polo
  pong
  pool
  pooling
  poop
  pooping
  poplin
  popping
  powwow
  wiping