Center letter: n
Outer letter: c e f i t v
Answers (42):
  ineffective
  infective
  cent
  efficient
  entente
  entice
  even
  event
  evince
  feint
  fence
  fifteen
  fine
  finite
  incentive
  incite
  inefficient
  infect
  infinite
  infinitive
  innie
  intent
  invective
  invent
  inventive
  invite
  invitee
  nene
  nice
  niece
  nine
  nineteen
  nite
  teen
  tenet
  tent
  tinct
  tine
  tint
  vein
  vent
  vine