Center letter: o
Outer letter: a g h i l n
Answers (56):
  haloing
  hooligan
  agog
  aioli
  aloha
  along
  analog
  anion
  anon
  gallon
  ganglion
  gigolo
  goal
  goggling
  going
  gong
  gonging
  gonna
  googling
  googol
  goon
  halo
  hogan
  hogging
  holing
  honing
  igloo
  lagoon
  lanolin
  lingo
  lion
  llano
  loan
  loaning
  loggia
  logging
  login
  logo
  loin
  loll
  lolling
  long
  longan
  longing
  loon
  noggin
  nonagon
  nonagonal
  nonillion
  noon
  ogling
  oiling
  olio
  ongoing
  onion
  oolong