The word "庙宇" is formed by combining the characters "庙" and "宇", each contributing to the meaning through their components. "庙" includes the radical "广" (indicating a building) and the phonetic element "朝", conveying the sense of a temple. "宇" contains the radical "宀" (representing a roof or house) and the phonetic "于", meaning a building or space. Together, they create a compound where both characters semantically emphasize the concept of a temple as a physical structure.