The Chinese word **头颅** (tóulú) is a compound noun formed through the combination of two semantically related characters: **头** (tóu), meaning "head," and **颅** (lú), meaning "skull" or "cranium." This structure follows a common pattern in Chinese word formation known as a *coordinative compound*, where two synonymous or closely associated morphemes are joined to create a single, more precise or formal term. Together, they specifically refer to the human head as a whole unit, often with a slight anatomical or literary nuance, emphasizing the physical structure rather than just the general concept of "head."