falter, stop, stumble, hesitate, pause, block one's utterance, stutter, repeat oneself, sputter, halt, hem and haw.
"stammer." YourDictionary, n.d. Web. 09 November 2018. <https://thesaurus.yourdictionary.com/stammer>.
stammer. (n.d.). Retrieved November 09th, 2018, from https://thesaurus.yourdictionary.com/stammer
To introduce involuntary repetitions and pauses into one's speech:
A speech impediment marked by involuntary repetitions and pauses:
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