The Chinese word **肿块 (zhǒng kuài)**, meaning "lump" or "mass" (often referring to a tumor or swelling), is a compound word formed by combining two meaningful characters: **肿 (zhǒng)**, which means "to swell" or "swelling," and **块 (kuài)**, which means "lump" or "chunk." This is a standard method of word formation in Chinese called **modifier-head compounding**, where the first character describes the state (swelling) and the second character specifies the object (a solid lump). Together, they create a precise medical and colloquial term for a swollen, solid mass of tissue.