Center letter: g
Outer letter: a l m o r u
Answers (39):
  glamour
  agar
  agog
  agora
  alga
  algal
  amalgam
  arugula
  augur
  gaga
  gala
  gall
  gamma
  glam
  glamor
  glom
  gloom
  glug
  glum
  goal
  googol
  gram
  gramma
  grammar
  grog
  groom
  guar
  gulag
  gull
  guru
  largo
  logo
  logogram
  logroll
  magma
  mammogram
  mogul
  raga
  ragu