doormat vs fitted carpet

doormat

noun
  • A coarse mat at the entrance to a house, upon which one wipes one's shoes. 

  • Someone who is overly submissive to others' wishes. 

fitted carpet

noun
  • carpet that is cut to fit the floorplan of a room 

How often have the words doormat and fitted carpet occurred in a corpus of books? (source: Google Ngram Viewer )