Haunches are the hindquarters of an animal or a human body. Synonyms for the word "haunches" include buttocks, tail end, rump, hind end, hindquarters, posterior, glutes, bottom, and derriere. These words are often used interchangeably, although some may have a more formal or informal connotation than others. Buttocks and posterior are more formal synonyms that are commonly used in medical or technical contexts, while rump and hindquarters are more informal and commonly used to describe farm or domestic animals. Glutes and derriere are more colloquial synonyms and are commonly used in a more casual or playful context.