approval vs hostility

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. 

hostility

noun
  • The state of being hostile. 

  • A hostile action, especially a military action. See hostilities for specific plural definition. 

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