Center letter: i
Outer letter: d h k n o w
Answers (20):
  hoodwink
  dink
  dino
  downwind
  hind
  kiddo
  kind
  kink
  kiwi
  oink
  onion
  widow
  widowhood
  wiki
  wind
  window
  wink
  winnow
  wino
  woodwind