The adjective "volgaic" pertains to the Volga River or the Volga region, which is located in Russia. Synonyms for "volgaic" include "Volgan," "Volgarian," and "Volgian." These terms are often used to describe things or people that are associated with the Volga, such as the Volga River itself, the people who live in the region, or the culture of the area. The use of these synonyms can help to add more detail and specificity to discussions about the Volga region and its significance and contributions to Russian history and culture.