ache vs appetite

ache

verb
  • To cause someone or something to suffer pain. 

  • To suffer pain; to be the source of, or be in, pain, especially continued dull pain; to be distressed. 

noun
  • Continued dull pain, as distinguished from sudden twinges, or spasmodic pain. 

appetite

noun
  • Desire to eat food or consume drink. 

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

  • Any strong desire; an eagerness or longing. 

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