pigeonholing

from WordNet (r) 3.0 (2006)

pigeonholing
    n 1: a system for classifying things into groups [syn:
         {grouping}, {pigeonholing}]

from Moby Thesaurus II by Grady Ward, 1.0

21 Moby Thesaurus words for "pigeonholing":
      analysis, arrangement, cataloging, categorization, classification,
      codification, division, filing, grading, grouping, indexing,
      placement, ranging, ranking, rating, sorting, stratification,
      subdivision, tabulation, taxonomy, typology