1) Stammering 2) Stuttering 
defect in articulation or pronunciation
• (n.) Indistinct pronunciation; stammering.
Synonym: stammering. ... Origin: G. Psellismos, a stammering ... (05 Mar 2000) ... 
Psel'lism noun [ Greek ..., from ... to stammer.] Indistinct pronunciation; stammering. 
Type: Term Pronunciation: sel′izm Synonyms: stammering
psellism Stammering or a speech disorder involving three factors: (1) dysfluency with repetition of words and parts of words, prolongations of sounds, interjections of sounds or words, and long pauses; (2) listener reaction, considering the dysfluency to be abnormal or unacceptable; and (3) the speaker's reaction to the dysfluency and to the listen...
stuttering; stammering.