The term BREATHING HOLE can be defined as a SPIRACLE, which is an 8-letter word. A SPIRACLE is an opening in the body of an animal that allows air to enter and exit the respiratory system. It is found in many species of animals, including insects, amphibians, and some reptiles. In humans, the SPIRACLE is located in the nose and mouth. The SPIRACLE helps to regulate the amount of oxygen entering the body and helps to maintain the body's temperature.