Center letter: f
Outer letter: b d e l o w
Answers (35):
  bedfellow
  beef
  beefed
  befell
  boffo
  doff
  doffed
  feeble
  feed
  feel
  fell
  felled
  fellow
  fled
  flee
  flew
  floe
  flood
  flooded
  flow
  flowed
  fobbed
  fold
  folded
  follow
  followed
  food
  fool
  fooled
  fowl
  offed
  wolf
  wolfed
  woof
  woofed