Center letter: u
Outer letter: d e f i l p
Answers (48):
  upfield
  delude
  deluded
  dude
  duel
  dueled
  duff
  duffel
  duffle
  dull
  dulled
  dupe
  duped
  duple
  elude
  eluded
  feud
  feuded
  flue
  fluff
  fluffed
  fluid
  fuddle
  fuddled
  fuel
  fueled
  fulfill
  fulfilled
  full
  lieu
  luff
  lull
  lulled
  lulu
  pileup
  puddle
  puddled
  puff
  puffed
  pule
  puled
  puli
  pull
  pulled
  pulp
  pulped
  pupil
  upped