Center letter: n
Outer letter: e i l p u v
Answers (35):
  vulpine
  eleven
  enliven
  ennui
  even
  innie
  lien
  line
  linen
  lineup
  liven
  lune
  lupine
  nene
  nine
  ninepin
  nipple
  null
  peen
  penile
  penne
  pine
  pinup
  pipeline
  pippin
  uneven
  unlevel
  unpen
  unpile
  unpin
  unveil
  vein
  venue
  venule
  vine