The Collaborative International Dictionary of English v.0.48:

Sifter \Sift"er\, n.
   1. One who, or that which, sifts.
      [1913 Webster]

   2. (Zool.) Any lamellirostral bird, as a duck or goose; -- so
      called because it sifts or strains its food from the water
      and mud by means of the lamell? of the beak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

sifter
    n 1: a household sieve (as for flour)

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "sifter":
   bolter, clarifier, colander, cradle, cribble, filter, grate,
   grating, lixiviator, percolator, purifier, refiner, refinery,
   riddle, rocker, screen, sieve, sorter, strainer, winnow,
   winnowing basket, winnowing fan, winnowing machine