Center letter: d
Outer letter: a i l n u v
Answers (22):
  individual
  avid
  dial
  dill
  diva
  divan
  dual
  dull
  inlaid
  inland
  invalid
  laid
  land
  laud
  livid
  nada
  naiad
  undid
  unlaid
  valid
  vandal
  vivid