encourage vs shelve

encourage

verb
  • To spur on, strongly recommend. 

  • To mentally support; to motivate, give courage, hope or spirit. 

  • To foster, give help or patronage 

shelve

verb
  • To set aside; to quit or postpone. 

  • To place on a shelf. 

  • To furnish with shelves. 

  • To slope; to incline; to form into shelves. 

  • To have sex with. 

  • To take (drugs) by anal or vaginal insertion. 

noun
  • A rocky ledge or shelf. 

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