Center letter: p
Outer letter: b e g i k n
Answers (35):
  beekeeping
  beep
  beeping
  epee
  keep
  keeping
  kepi
  kingpin
  ninepin
  nipping
  peeing
  peek
  peeking
  peen
  peep
  peeping
  pegging
  peke
  penne
  penning
  pepping
  pigging
  pigpen
  pike
  pine
  ping
  pinging
  pining
  pink
  pinkie
  pinking
  pinning
  pipe
  piping
  pippin