Center letter: v
Outer letter: a g i n r t
Answers (21):
  aggravating
  gravitating
  arriving
  avatar
  avian
  aviating
  giving
  invariant
  inviting
  navigating
  nirvana
  ravaging
  raving
  titivating
  trivia
  vagina
  vagrant
  vain
  variant
  virgin
  vitiating