culling vs excerption

culling

noun
  • The act by which things are culled; the process of selecting for acceptance or removal. 

  • Anything separated or selected from a mass. 

excerption

noun
  • The act of excerpting or selecting. 

  • That which is selected or gleaned; an extract. 

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