Center letter: a
Outer letter: d h i l o y
Answers (27):
  holiday
  ahoy
  aioli
  allay
  alloy
  ally
  aloha
  daddy
  dahlia
  daily
  dally
  daylily
  dial
  dillydally
  doodad
  dyad
  hail
  halal
  hall
  halo
  hiya
  lady
  laid
  load
  loyal
  loyally
  yahoo