Center letter: u
Outer letter: b d e h l m
Answers (49):
  humbled
  blue
  bluebell
  bubble
  bubbled
  budded
  bulb
  bulbed
  bull
  bumble
  bumblebee
  bumbled
  bummed
  delude
  deluded
  dubbed
  dude
  duded
  duel
  dueled
  dull
  dulled
  dumb
  dumbbell
  dumbed
  dumdum
  elude
  eluded
  hubbub
  huddle
  huddled
  hued
  hull
  hulled
  humble
  hummed
  lube
  lubed
  lull
  lulled
  lulu
  muddle
  muddled
  mule
  mull
  mulled
  mumble
  mumbled
  muumuu