flocking vs intensification

flocking

noun
  • The process of adding small particles to a surface for the sake of texture. 

  • A material textured in this way, such as the artificial snow of a Christmas tree. 

intensification

noun
  • The act or process of intensifying, or of making more intense. 

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