Center letter: n
Outer letter: a c k l o u
Answers (45):
  uncloak
  anal
  annal
  annual
  annul
  anon
  canal
  cancan
  canna
  cannon
  cannula
  canola
  canon
  clan
  clank
  clonk
  clunk
  cocoon
  colcannon
  colon
  conk
  knack
  knock
  knoll
  koan
  lacuna
  lank
  llano
  loan
  loon
  luna
  lunk
  lunula
  naan
  nana
  nock
  nonlocal
  nook
  noon
  noun
  null
  ulna
  uncock
  uncool
  unlock