suer

from WordNet (r) 3.0 (2006)

suer
    n 1: a man who courts a woman; "a suer for the hand of the
         princess" [syn: {suitor}, {suer}, {wooer}]
    2: someone who petitions a court for redress of a grievance or
       recovery of a right [syn: {suer}, {petitioner}]

from The Collaborative International Dictionary of English v.0.48

Suer \Su"er\, n.
   One who sues; a suitor.
   [1913 Webster]