- 二重母音 èrchóngmǔyīn diphthonga complex vowel sound formed by two vowels in a single syllable; complex nucleus
- 半母音 bànmǔyīn semivowelA sound that is phonetically similar to a vowel but functions as the boundary of a syllable rather than as the core, similar to a consonant; also called a [[半子音|半子音|ban4 zi3 yin1]].
- 双重母音 shuāngchóngmǔyīn diphthongtwo vowel sounds joined in one syllable to form a single sound
- 复合母音 fùhémǔyīn compound vowela compound vowel or diphthong; a sound formed by the combination of two or more vowels in a single syllable
- 母音调和 mǔyīntiáohé vowel harmonyvowel harmony in phonetics