Jejunum is a medical term that refers to a part of the small intestine, but there are other words that can be used to describe this anatomical structure. For example, the jejunum is also known as the upper small intestine or the second part of the small intestine. In terms of function, the jejunum is responsible for absorbing nutrients from food and passing them into the bloodstream. Another related term is the ileum, which is the third part of the small intestine and continues the absorption process. Overall, while jejunum is the specific medical term, there are other synonyms that can help convey its meaning and role in the digestive system.