Center letter: a
Outer letter: b c e k m o
Answers (42):
  comeback
  aback
  acme
  ameba
  amebae
  ammo
  amoeba
  amoebae
  amok
  baba
  babe
  babka
  back
  backcomb
  bake
  bamboo
  baobab
  beak
  beam
  became
  boba
  cacao
  cake
  came
  cameo
  camo
  coca
  cocoa
  coma
  comma
  kabob
  kaboom
  kebab
  mace
  make
  mako
  mama
  mamba
  mambo
  mamma
  mecca
  momma