approval vs brickbat

approval

noun
  • Something mailed by a seller to a collector to match their stated interests; the collector can approve of or return the item. 

  • An expression granting permission; an indication of agreement with a proposal; an acknowledgement that a person, thing, or event meets requirements. 

  • An expression of favorable acceptance and encouragement; a compliment that also condones. 

brickbat

noun
  • A piece of brick used as a weapon, especially if thrown, or placed in something like a sock and used as a club. 

  • A criticism or uncomplimentary remark. 

verb
  • To assail with criticism. 

  • To attack by throwing brickbats. 

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