Center letter: t
Outer letter: a c f m o u
Answers (28):
  factotum
  afoot
  atom
  auto
  automat
  automata
  coat
  coot
  cutoff
  cutout
  fact
  foot
  moat
  moot
  motto
  mutt
  taco
  tact
  tattoo
  taut
  toccata
  tofu
  tomato
  tomcat
  toot
  tout
  tuft
  tutu