Center letter: c
Outer letter: a g i n t v
Answers (38):
  activating
  inactivating
  vacating
  vaccinating
  acacia
  acai
  acing
  acting
  antic
  attic
  cacti
  caging
  cancan
  caning
  canna
  canning
  cant
  cantata
  cantina
  cava
  caving
  citing
  civic
  gigantic
  icing
  incant
  incanting
  inciting
  intact
  niacin
  tacit
  tact
  tactic
  tactician
  tannic
  tinct
  titanic
  vacant