1) Defect of speech 2) Speech defect 3) Speech disorder 
<neurology> A disorder of speech where there is an involuntary repetition several times of the same word. ... (16 Mar 1998) ... 
(kat″ә-fa´zhә) verbigeration.
[n] - a speech disorder in which the same word is repeated several times in succession
cataphasia 1. A speech disorder in which the same word is repeated several times in succession. 2. A stereotyped and meaningless repetition of words and phrases, as seen in some cases of schizophrenia.
noun a speech disorder in which the same word is repeated several times in succession