This is the 5867th most frequent Chinese word.
地毯
Carpet; rug.
In this sentence, '地毯' is used as a noun referring to an object, specifically a rug or carpet placed in the living room.
客厅里有一张漂亮的地毯。
There is a beautiful carpet in the living room.
Here, '地毯' again serves as a noun, but this time it is part of a possessive construct describing the location of the dust being cleaned.
她正在清理地毯上的灰尘。
She is cleaning the dust on the carpet.
The word '地毯' is used as the direct object of the verb '买' (to buy), identifying the item purchased.