"Buba" is a word that has a limited number of synonyms, as it is often used as a character name or slang term. When used to describe a person's appearance, possible synonyms could include "chubby," "plump," or "portly." As a nickname, "Bubba" is a common variation. In some regions, "baba" or "bubu" might also be used as alternative spellings or variations. Overall, the meaning of "buba" will largely depend on the context in which it is used, and it is important to consider this when selecting an appropriate synonym to substitute for this word.