I decided to look at the synonym in the dictionary of the word:

substrate
Mat, chanted, nightmare, stalk, marra, girl, prostitute, placement, laughra, laughra, laughra, laughra, laughra, putana, larva, padla, laughra, strawosa, laughra, walking, slapping, prostitute, mattress, hippies, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping, slapping

The carpet, of course. Thank you very much, the internet!