I've always thought carpets was a weird word. It sounds like it should be a pet for your car - you know car pet? Like a Vespa or something.
But no, carpets are really synthetic coverings to go over your floors. I guess "synthetic covering to go over your floor" would take to long to say though if you needed to warn somebody that their carpet was on fire. To be fair though, a frantic point and "FIRE!" would also do the job.