appetite vs strength

appetite

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

  • Desire to eat food or consume drink. 

  • Any strong desire; an eagerness or longing. 

strength

noun
  • The strongest part of something; that on which confidence or reliance is based. 

  • The intensity of a force or power; potency. 

  • The quality or degree of being strong. 

  • A positive attribute. 

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