Center letter: a
Outer letter: d i l n u v
Answers (46):
  individual
  alluvial
  anal
  annal
  annual
  annul
  annuli
  anvil
  avail
  avian
  avid
  dial
  diva
  divan
  dual
  inlaid
  inland
  invalid
  laid
  lain
  lanai
  land
  laud
  lava
  luau
  luna
  lunula
  naan
  nada
  naiad
  nail
  nana
  naval
  ulna
  unlaid
  uvula
  vain
  valid
  vandal
  vanilla
  vanillin
  vial
  villa
  villain
  vulva
  vulval