Burro is a Spanish word that refers to a small donkey. If you're looking for synonyms for the word "burro," there are several options to choose from. One of the most common synonyms for burro is "donkey," which is used widely in English. Another option would be "ass," which is an older term for a donkey. Other synonyms for burro might include "mule," which is a cross between a donkey and a horse, or "jackass," which is a less polite term for a male donkey. Some other lesser-known synonyms for burro could include "hinny," which is a cross between a female donkey and a male horse, or "jennet," which is a female donkey.