WordNet (r) 3.0 (2006):

dysphasia
    n 1: an impairment of language (especially speech production)
         that is usually due to brain damage

Moby Thesaurus II by Grady Ward, 1.0:

44 Moby Thesaurus words for "dysphasia":
   aphasia, aphonia, artificial voice, broken speech, broken tones,
   broken voice, childish treble, choked voice, cracked voice, croak,
   crow, dysarthria, dyslalia, dyslogia, dysphonia, dysphrasia,
   echolalia, falsetto, harshness, hawking voice, hiss, hoarseness,
   hysterical aphonia, idioglossia, idiolalia, impairment of speech,
   imperfect speech, incoherence, lisp, lisping, loss of voice,
   mutism, muzzy speech, nasal tone, nasalization, psychophonasthenia,
   quaver, shake, sibilation, speech defect, speech impediment,
   tremor, twang, verbigeration