Center letter: r
Outer letter: a c i l p t
Answers (58):
  practical
  altar
  apart
  apparat
  arctic
  aria
  aril
  atria
  atrial
  attar
  attract
  carat
  carp
  carpal
  carpi
  cart
  cataract
  circa
  cirri
  citric
  claptrap
  crap
  critic
  critical
  lair
  lariat
  liar
  lira
  pair
  part
  partial
  partita
  pillar
  piratic
  prat
  priapic
  racial
  rail
  railcar
  raita
  rapt
  ratatat
  rattail
  rattrap
  rial
  rill
  tapir
  tarp
  tart
  tartar
  tiara
  tract
  trail
  trait
  trap
  trial
  trill
  trip