The article is based on theories about Vietnamese words, an overview of the Tay people and their festivals to study the characteristics of words about the Tay people's festival in terms of its structural features, usage scope, and origins. The research results indicate that traditional festival-related words is diverse in structure, with origins rooted in both pure Vietnamese and Sino-Vietnamese. In terms of meaning, the word is more concentrated in the Ceremon (Lễ) part than the Festival (Hội) part. Therefore, traditional festivals in general, and the Tay people's festivals in Vietnam in particular, represent a form of cultural activity, a spiritual product that has been shaped and developed throughout history by the local population.