Horse manure, also known as equine manure, is a common term used to refer to the feces and urine of horses. However, there are a variety of synonyms that can be used interchangeably. Some of these synonyms include horse dung, horse droppings, horse waste, horse excrement, horse poop, and horse doo-doo. These terms can be used to describe the same thing but with different levels of formality and connotation. While these terms may all refer to the same thing, they can have different implications based on context and the intended audience. Regardless of which term is used, horse manure is a valuable source of nutrients for plants and is commonly used as a natural fertilizer.