appetite vs soft spot

appetite

noun
  • Any strong desire; an eagerness or longing. 

  • Desire to eat food or consume drink. 

  • The desire for some personal gratification, either of the body or of the mind. 

soft spot

noun
  • A sentimental fondness or affection. 

  • A point of vulnerability in a defence. 

  • A fontanelle. 

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