A synonym for choana can be found in the term "internal nostril." Other possible synonyms for choana include nasal fossa, nasal cavity, and nasal passage. The term choana, however, is most commonly used in the field of anatomy and biology to describe a specific anatomical feature of certain animals, including mammals, amphibians, and reptiles. The choana is a passageway located at the back of the nasal cavity that connects the nose to the throat, allowing for the passage of air and other substances. Understanding the various synonyms for choana can be helpful in describing this important anatomical structure in scientific and medical contexts.