Center letter: t
Outer letter: a b c k o u
Answers (33):
  outback
  abbot
  about
  abut
  attack
  auto
  boat
  bobcat
  boot
  bout
  butt
  buttock
  coat
  cockatoo
  cookout
  coot
  cutback
  cutout
  taboo
  tack
  taco
  tact
  tattoo
  taut
  tobacco
  toccata
  tock
  took
  toot
  tout
  tuba
  tuck
  tutu