The Chinese word **枪口** (qiāngkǒu), meaning "gun muzzle" or "gun barrel," is a classic example of a **modifier-head compound noun** formed through semantic combination. The first character **枪** (qiāng) means "gun" or "spear," acting as the modifier that specifies the type. The second character **口** (kǒu) literally means "mouth" or "opening," serving as the head that denotes the core concept—here, metaphorically extended to mean the "aperture" or "front end" from which a projectile exits. Thus, the compound logically and visually signifies the "mouth of a gun."