Definitions:

1. Refers to a group of languages and ethnic groups in China, Laos, and Vietnam. NOUN
   • The Kam-Sui people are known for their unique musical traditions, including the wold famous Dong Grand Choirs.
2. Refers to a subgroup of the Kra-Dai language family, spoken primarily by ethnic groups in Southern China. NOUN
   • Linguistics study the Kam-Sui languages to better understand the historical migration of the Tai-Kadai people.

Synonyms:

• dong-sui languages
• kra-dai language subgroup
• tai-kadai ethnic groups