The Chinese word **雨伞 (yǔsǎn)** is a compound noun formed through semantic combination: the first character **雨 (yǔ)** means "rain," and the second character **伞 (sǎn)** means "umbrella." When combined, they create a precise, descriptive term meaning "rain umbrella," logically specifying the primary function of the object (an umbrella for rain) as opposed to other types, such as a parasol (遮阳伞). This construction follows the common Chinese word-formation pattern where a modifying element (雨) is placed before a core noun (伞) to define its purpose or key characteristic.