The Collaborative International Dictionary of English v.0.48:

Prevaricator \Pre*var"i*ca`tor\, n. [L. praevaricator: cf. F.
   pr['e]varicateur.]
   1. One who prevaricates.
      [1913 Webster]

   2. (Roman Law) A sham dealer; one who colludes with a
      defendant in a sham prosecution.
      [1913 Webster]

   3. One who betrays or abuses a trust. --Prynne.
      [1913 Webster]

WordNet (r) 3.0 (2006):

prevaricator
    n 1: a person who has lied or who lies repeatedly [syn: liar,
         prevaricator] [ant: square shooter, straight arrow,
         straight shooter]

Moby Thesaurus II by Grady Ward, 1.0:

41 Moby Thesaurus words for "prevaricator":
   Ananias, Baron Munchausen, Father of Lies, Satan,
   Sir John Mandeville, captious critic, caviler, consummate liar,
   dirty liar, equivocator, fabricator, fabulist, false witness,
   falsifier, fibber, fibster, habitual liar, hairsplitter, hedger,
   liar, mystificator, mystifier, mythomaniac, nitpicker,
   obscurantist, palterer, pathological liar, perjurer, pettifogger,
   picayune critic, pseudologist, pseudologue, pussyfoot, pussyfooter,
   quibbler, shuffler, spinner of yarns, storyteller, tergiversator,
   yarn spinner, yarner



The Devil's Dictionary (1881-1906):

PREVARICATOR, n.  A liar in the caterpillar estate.