The term 'protuding part' can be described as a BULGE, which is a five-letter word. A BULGE is an outward protrusion or swelling from a surface or flat plane. It is often used to describe the shape of something that is curved or rounded. Bulges can be found in many different objects, such as mountains, buildings, and even clothing. They are also commonly seen in the human body, particularly in areas such as the abdomen, chest, and buttocks.