If you're looking for synonyms for the word "bustards," there are a few different options depending on what type of bird species you're trying to describe. Some similar birds include ostriches, emus, rheas, and cassowaries; these are all flightless birds that are generally larger than bustards. However, if you're looking for a more accurate synonym for bustards specifically, you might consider using words like "great bustard," "little bustard," or "Kori bustard," which are different species of bird within the same family as bustards. These birds are typically found in open grasslands and are known for their distinctive courtship displays and elaborate mating rituals.