Center letter: p
Outer letter: c d e i k n
Answers (49):
  picnicked
  deep
  deepen
  deepened
  depend
  depended
  dependence
  dipped
  epee
  epic
  epicene
  incipience
  independence
  keep
  kepi
  ninepin
  nipped
  peck
  pecked
  peed
  peek
  peeked
  peen
  peep
  peeped
  peke
  pence
  pend
  pended
  penne
  penned
  pepped
  pick
  picked
  picnic
  piece
  pieced
  pied
  pike
  pine
  pined
  pink
  pinked
  pinkie
  pinned
  pinniped
  pipe
  piped
  pippin