pursuer

from WordNet (r) 3.0 (2006)

pursuer
    n 1: a person who is pursuing and trying to overtake or capture;
         "always before he had been able to outwit his pursuers"
         [syn: {pursuer}, {chaser}]
    2: a person who pursues some plan or goal; "a pursuer of truth"

from The Collaborative International Dictionary of English v.0.48

Pursuer \Pur*su"er\, n.
   1. One who pursues or chases; one who follows in haste, with
      a view to overtake.
      [1913 Webster]

   2. (Eccl. & Scots Law) A plaintiff; a prosecutor.
      [1913 Webster]

from Bouvier's Law Dictionary, Revised 6th Ed (1856)

PURSUER, canon law. The name by which the complainant or plaintiff is known 
in the ecclesiastical courts. 3 Eng. Eccl. R. 350.

from Moby Thesaurus II by Grady Ward, 1.0

63 Moby Thesaurus words for "pursuer":
      addict, adherent, admirer, adorer, amorist, appendage, attendant,
      buff, bug, cavaliere servente, chaser, collector, courtier,
      dangler, demon, dependent, disciple, eager beaver, energumen,
      enthusiast, faddist, fan, fanatic, fiend, flunky, follower,
      following, freak, great one for, hanger-on, henchman, hobbyist,
      homme de cour, hound, hunter, infatuate, lover, nut, paramour,
      parasite, partisan, public, pursuant, pursuivant, quester,
      rhapsodist, satellite, sectary, seeker, shadow, stooge, successor,
      sucker for, suitor, supporter, tagtail, tail, trainbearer,
      visionary, votary, ward heeler, wooer, zealot