Center letter: o
Outer letter: a k m n r w
Answers (49):
  workman
  workwoman
  ammo
  amok
  anon
  anorak
  armor
  aroma
  arrow
  know
  known
  koan
  kook
  korma
  krona
  kronor
  kroon
  mako
  mammon
  manor
  maroon
  marrow
  moan
  momma
  monk
  mono
  moon
  moor
  morn
  moron
  morrow
  mown
  narrow
  nook
  noon
  norm
  okra
  roam
  roan
  roar
  rook
  room
  rowan
  woman
  wonk
  work
  workroom
  worm
  worn