Center letter: d
Outer letter: h i l o y a
Answers (30):
  holiday
  daddy
  dahlia
  daily
  dally
  daylily
  dial
  diddly
  dildo
  dill
  dilly
  dillydally
  dodo
  doily
  doll
  dolly
  doodad
  dyad
  hold
  hood
  hoodoo
  hyoid
  idly
  idol
  idyl
  idyll
  lady
  laid
  load
  oddly