1. Diphthong:
* This is a single vowel sound that changes quality during its pronunciation. It involves moving the tongue and/or lips from one vowel position to another. Examples include "oi" in "boy," "ow" in "cow," and "ay" in "say."
2. Vowel Digraph:
* This is two letters representing a single vowel sound. Examples include "ea" in "bread" (short e sound), "oo" in "moon" (long u sound), and "ai" in "rain" (long a sound).
3. Vowel Clusters:
* This refers to two or more vowels appearing consecutively in a word, sometimes representing a single sound (like a diphthong) and sometimes representing separate sounds. Examples include "ai" in "hair" (diphthong), "eau" in "beau" (separate vowel sounds), and "iei" in "pie" (separate vowel sounds).
To clarify what you mean, please provide an example of a word or sound you are referring to.