The Collaborative International Dictionary of English v.0.48:

Nominalism \Nom"i*nal*ism\, n.
   The principles or philosophy of the Nominalists.
   [1913 Webster]

WordNet (r) 3.0 (2006):

nominalism
    n 1: (philosophy) the doctrine that the various objects labeled
         by the same term have nothing in common but their name

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "nominalism":
   differentiation, differentness, distinctiveness, egohood,
   human factor, identity, individualism, individuality, integrity,
   nonconformity, oneness, particularism, particularity,
   personal equation, personal identity, personality, personship,
   self-identity, selfhood, selfness, singularity, soul, uniqueness