The Chinese word **天窗** (tiānchuāng) is a compound noun formed through semantic combination: the first character **天** (tiān) means "sky" or "heaven," and the second character **窗** (chuāng) means "window." Together, they literally describe a "sky window"—a structural opening in a roof or ceiling that allows natural light to enter from above, which corresponds directly to the English word "skylight." This is a typical example of Chinese word formation where two meaningful characters are joined to create a new, transparently descriptive term for a concrete object or concept.