Center letter: a
Outer letter: g h l m p u
Answers (39):
  galumph
  alga
  algal
  alpha
  alum
  amalgam
  appall
  gaga
  gala
  gall
  gamma
  glam
  gulag
  halal
  hall
  haul
  hula
  lama
  lamp
  laugh
  llama
  luau
  magma
  mall
  mama
  mamma
  mammal
  maul
  mullah
  palapa
  pall
  palm
  palp
  pampa
  papa
  papal
  puma
  pupa
  pupal