The word "亭台楼榭" is formed by combining four distinct characters, each representing a specific type of traditional Chinese architectural structure: 亭 (tíng) refers to a pavilion, 台 (tái) to a terrace or platform, 楼 (lóu) to a multi-storied building, and 榭 (xiè) to a waterside pavilion. Together, they create a compound noun that collectively denotes a variety of elegant buildings, often found in classical gardens or landscapes, by listing these related elements in a coordinated sequence.