Center letter: o
Outer letter: a c e l n w
Answers (51):
  allowance
  aeon
  allow
  aloe
  alone
  anon
  cacao
  callaloo
  callow
  cannon
  canoe
  canola
  canon
  cello
  cloaca
  clone
  clown
  coal
  coca
  cocoa
  cocoon
  cola
  colcannon
  colleen
  colon
  colonel
  conceal
  cone
  cool
  cowl
  llano
  loan
  local
  locale
  loco
  loll
  lone
  loon
  neocon
  neon
  noel
  nonce
  none
  nonlocal
  noon
  ocean
  oleo
  once
  wallow
  wool
  woolen