The Tupi-Guarani language is an indigenous language spoken by various tribes in South America. There are several synonyms for this language, including the Tupinambá language, the Guarani language, and the Nheengatu language. All of these names refer to the same language, with slight variations in dialect and usage depending on the region. The Tupi-Guarani language has a rich history and cultural significance, with many myths and stories passed down through generations. Despite its importance, the language is at risk of dying out due to the pressures of cultural assimilation and the dominance of Spanish and Portuguese in the region.