WordNet (r) 3.0 (2006):

creativity
    n 1: the ability to create [syn: creativity, creativeness,
         creative thinking] [ant: uncreativeness]

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "creativity":
   Geist, Muse, afflatus, authenticity, creative thought,
   creativeness, daemon, daimonion, demon, divine afflatus, fecundity,
   fertile mind, fertility, fire of genius, freshness, genius,
   ingenuity, innovation, inspiration, invention, inventiveness,
   newness, nonimitation, novelty, originality, pregnant imagination,
   productivity, prolificacy, soul, spirit, talent,
   teeming imagination, uniqueness