Center letter: n
Outer letter: d e i p u z
Answers (51):
  unzipped
  deepen
  deepened
  denied
  denizen
  denude
  denuded
  depend
  depended
  dine
  dined
  dune
  dunned
  ended
  endue
  endued
  ennui
  indeed
  indie
  innie
  need
  needed
  nene
  nine
  ninepin
  nipped
  nude
  nudie
  peen
  pend
  pended
  penne
  penned
  pine
  pined
  pinned
  pinniped
  pinup
  pippin
  punned
  undid
  undue
  unneeded
  unpen
  unpenned
  unpin
  unpinned
  unzip
  upend
  upended
  zine