Center letter: b
Outer letter: a h i l t y
Answers (32):
  habitability
  ability
  ably
  alibi
  baba
  baby
  baht
  bail
  bait
  ball
  bath
  battily
  batty
  bialy
  bilabial
  bill
  billy
  blab
  blabby
  blah
  blat
  habit
  habitat
  hillbilly
  labia
  labial
  lability
  liability
  tabby
  tabla
  tibia
  tibial