Center letter: c
Outer letter: a i l n t u
Answers (53):
  lunatic
  nautical
  acacia
  acai
  actual
  antic
  attic
  cacti
  calculi
  call
  calla
  canal
  cancan
  canna
  cannula
  cant
  cantata
  cantina
  catcall
  cattail
  caul
  cilia
  clan
  clinic
  clinical
  clinician
  cull
  cult
  cultic
  iliac
  illicit
  incant
  intact
  italic
  lactic
  lacuna
  laic
  laical
  licit
  lilac
  niacin
  tacit
  tact
  tactic
  tactical
  tactician
  tactual
  talc
  tannic
  tinct
  titanic
  tunic
  uncut