1) Compulsion 2) Obsession 
word repetition
irresistible desire to repeat certain words
<psychiatry> An abnormal impulse to dwell upon certain words and their supposed significance, or to frantically try to recall a particular word. ... Origin: G. Onoma, name, + mania, frenzy ... (05 Mar 2000) ... 
(on″ә-mat″ә-ma´ne-ә) irresistible preoccupation with specific names or words.
Type: Term Pronunciation: on′ō-mat′ō-mā′nē-ă Definitions: 1. An abnormal impulse to dwell on certain words and their supposed significance, or to try to recall frantically a particular word.
[n] - obsession with a particular word which the person uses repeatedly or which intrudes into consciousness
onomatomania 1. A mania for names. 2. A morbid preoccupation with words and names or a mania for word-making.3. A preoccupation with words and names.4. An abnormal impulse to dwell upon certain words and their supposed significance or to frantically try to recall a particular word.
noun obsession with a particular word which the person uses repeatedly or which intrudes into consciousness