The word 庖厨 is formed by combining two synonymous characters: 庖, meaning kitchen or cook, which is composed of the building-related radical 广 and the component 包 that primarily indicates pronunciation, and 厨, also meaning kitchen or cook, which is composed of the structure-related radical 厂 and the component 寸 that similarly aids in sound. Together, these characters create a compound word that reinforces the concept of a kitchen or cooking area through their shared semantic focus.