What do you use to pronounce parts of a letter?\nOptions:\n- joke\n- word\n- number\n- syllable\n- english alphabet
Step-by-step reasoning process below:

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Syllable is a unit of pronunciation having one vowel sound, with or without surrounding consonants, forming the whole or a part of a word. We used to pronounce syllable for the parts of a letter. The answer: syllable.
Assistant