painting vs wallcovering

painting

noun
  • An illustration or artwork done with the use of paint. 

  • The same activity as an art form. 

  • The action of applying paint to a surface. 

wallcovering

noun
  • A covering for a wall, such as wallpaper 

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