Center letter: a
Outer letter: b i o r t v
Answers (50):
  vibrato
  vibrator
  abbot
  abort
  airboat
  aorta
  arbitrator
  arbor
  arborio
  aria
  atria
  attar
  avatar
  aviator
  baba
  bait
  baobab
  barb
  barrio
  biota
  boar
  boat
  boba
  brat
  brava
  bravo
  briar
  iota
  orator
  oratorio
  rabbi
  rabbit
  raita
  ratatat
  ratio
  roar
  rotator
  taboo
  tabor
  taro
  tarot
  tart
  tartar
  tattoo
  tiara
  tibia
  trait
  traitor
  trattoria
  trivia