Center letter: g
Outer letter: a l m o p y
Answers (39):
  polygamy
  agog
  alga
  algal
  amalgam
  apology
  gaga
  gala
  gall
  gallop
  galop
  gamma
  gamy
  gayly
  glam
  glom
  gloom
  gloomy
  gloop
  gloopy
  glop
  gloppy
  goal
  goggly
  golly
  googly
  googol
  goop
  goopy
  laggy
  lallygag
  logo
  logy
  lollygag
  magma
  mammalogy
  pogo
  pygmy
  yoga