WordNet (r) 3.0 (2006):

unmasking
    n 1: the exposure of an impostor or a fraud; "he published an
         expose of the graft and corruption in city government"
         [syn: expose, unmasking]

Moby Thesaurus II by Grady Ward, 1.0:

25 Moby Thesaurus words for "unmasking":
   apocalypse, baring, disclosing, disclosure, discovering, discovery,
   expose, exposition, exposure, laying bare, manifestation,
   patefaction, removing the veil, revealing, revealment, revelation,
   showing up, showup, stripping, uncloaking, uncovering, unfolding,
   unfoldment, unveiling, unwrapping