Center letter: i
Outer letter: d k l n o w
Answers (33):
  downlink
  dildo
  dill
  dink
  dino
  downwind
  idol
  kiddo
  kill
  kiln
  kilo
  kind
  kink
  kiwi
  link
  lion
  loin
  nonillion
  oink
  olio
  onion
  widow
  wiki
  wild
  wildwood
  will
  willow
  wind
  window
  wink
  winnow
  wino
  woodwind