Combat sport is a term used to describe any type of physical activity that involves two or more opponents engaging in physical contact with the intention of defeating each other. The most popular combat sport is BOXING, which is a 6-letter word. BOXING is a sport in which two opponents fight using their fists in an attempt to knock out their opponent. It is a sport that has been around for centuries and is still popular today. It is a sport that requires skill, strength, and endurance, and is often seen as a test of character.