Center letter: i
Outer letter: a c n t v y
Answers (39):
  inactivity
  acacia
  acai
  activity
  anti
  antic
  attain
  attic
  avian
  cacti
  cantina
  cavity
  city
  civic
  cynic
  inanity
  incant
  intact
  itty
  nativity
  niacin
  ninny
  tacit
  tactic
  tactician
  taint
  tannic
  tannin
  tinct
  tinny
  tint
  tiny
  titan
  titanic
  vain
  vanity
  vicinity
  viny
  vivacity