Which term is defined as a vowel or cluster of letters containing a vowel and pronounced as a unit?

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The main idea here is how letters come together to represent one sound. A phonogram is a unit formed by one or more letters that stands for a single phoneme. That often includes a vowel or a cluster that contains a vowel and is pronounced as one sound, such as “igh” in night (/aɪ/) or “ea” in beat (/iː/). The focus is on the sound represented by the letter group, not on counting syllables or patterns of sounds in lines of verse.

This makes it a better fit than the other terms. A syllable is a unit of pronunciation centered around a vowel and can be longer or shorter than a single sound unit; it’s about rhythm and pronunciation chunks, not specifically about the letter groups that spell one sound. Alliteration is about repeating initial sounds in neighboring words, a pattern idea rather than a unit of letter sounds. Consonant digraphs are letter pairs that produce one sound but do not contain a vowel, so they don’t meet the criterion of containing a vowel and being pronounced as a unit.