WordNet (r) 3.0 (2006):

schizophrenia
    n 1: any of several psychotic disorders characterized by
         distortions of reality and disturbances of thought and
         language and withdrawal from social contact [syn:
         schizophrenia, schizophrenic disorder, schizophrenic
         psychosis, dementia praecox]

Moby Thesaurus II by Grady Ward, 1.0:

43 Moby Thesaurus words for "schizophrenia":
   alternating personality, brain disease, catatonia,
   catatonic schizophrenia, crack-up, dementia praecox,
   depersonalization, disconnection, dissociation,
   dissociation of personality, double personality, dual personality,
   emotional disorder, emotional dissociation, emotional instability,
   functional nervous disorder, hebephrenia,
   hebephrenic schizophrenia, insanity, maladjustment,
   manic-depressive psychosis, melancholia, mental disorder,
   mental dissociation, mental illness, multiple personality,
   nervous breakdown, nervous disorder, neurosis, paranoia,
   paranoid personality, paranoid psychosis, paraphrenia,
   personality disorder, personality disorganization,
   problems in living, psychosis, reaction, schizoid personality,
   schizoidism, schizothymia, social maladjustment,
   split personality