The Hindi-derived word Wikipedia uses for sweets shared at Diwali family feasts is mithai.
Mithai is a broad term for confectionery and desserts from the Indian subcontinent. Diwali celebrations commonly include families preparing, buying, exchanging, and sharing mithai as part of hospitality and gift-giving. The word can refer to many kinds of sweets rather than one recipe or a single regional specialty.
Examples include barfi, laddoo, jalebi, peda, gulab jamun, kheer, and rasgulla, although recipes and names vary widely by region. Mithai may be made from sugar, flour, milk solids, nuts, fruits, grains, or other ingredients. It is also used for weddings, religious offerings, festivals, and visits between relatives. Prasad means food sanctified through worship, while namkeen refers to savory snacks, so neither is the general word for Diwali sweets.