scrapbook vs sketchbook

scrapbook

noun
  • a book, similar to a notebook or journal, in which personal or family memorabilia and photos are collected and arranged 

verb
  • to create scrapbooks. 

sketchbook

noun
  • A book of printed sketches. 

  • A book or pad with blank pages for sketching; a sketch pad. 

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