collage vs imitation

collage

noun
  • The technique of producing a work of art of this kind. 

  • A picture made by sticking other pictures onto a surface. 

  • A composite object or collection (abstract or concrete) created by the assemblage of various media; especially for a work of art such as text, film, etc. 

verb
  • To make into a collage. 

imitation

noun
  • The act of imitating. 

  • A copy or simulation; something that is not the real thing. 

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