"Doo-doo" is a common slang term for human or animal feces. However, there are several other synonyms that can be used instead of doo-doo. Some alternative words for doo-doo include poop, feces, excrement, dung, and waste. These words are often used to describe a bodily waste product that is produced by humans or animals. While doo-doo is a playful or childish term, the other synonyms for the word often carry a more serious or medical connotation. It is important to be familiar with these synonyms, especially in cases where animals or humans may be experiencing gastrointestinal issues or illness.