Stutter or stammer?

[lizavieta1]

Obydwa tłumaczymy jako jąkać się.
Ale: stammer - to speak or say something with unusual pauses or repeated
sounds, either because of speech problems or because of fear and anxiety:
stutter - to speak or say something, especially the first part of a word,
with difficulty, for example pausing before it or repeating it several times
tak więc stammer wskazywałoby na stały problem z mową,a stutter jako jedynie
np zacinanie się zwłaszcza w trudnych sytuacjach?

[justa_79]

To stammer is to speak with difficulty, hesitating, and repeating words: 'I
can't– can't– don't know how to thank you,' he stammered. To stutter is also to
speak with difficulty, but typically involves repeating a single letter rather
than a whole word: 'B-b-but you s-s-said you'd t-t-tell me,' she stuttered.
From the Hutchinson Encyclopaedia