What term describes a unit of pronunciation that is organized around a vowel?

The term that describes a unit of pronunciation organized around a vowel is "syllable." A syllable consists of a central vowel sound, which may or may not be surrounded by consonants. This fundamental structure is essential in understanding the basics of phonics and reading. Syllables play a crucial role in the way words are broken down for pronunciation, spelling, and reading fluency.

Considering the context of the other options, an open syllable refers to a syllable that ends with a vowel, meaning it does not have a consonant following the vowel. This specific type of syllable is just one aspect of syllable structure. The "Consonant - LE" refers specifically to a particular type of syllable pattern found in some English words, while a vowel pair typically refers to two adjacent vowels that together create a specific vowel sound in a word, which also does not encompass the entirety of syllable definition. Thus, the broad and inclusive definition of a syllable is the most accurate answer.